diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7abeb6c4..604d6254 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,81 +12,38 @@ on:
 jobs:
   build:
     name: ${{ matrix.config.name }}
-    runs-on: ${{ matrix.config.os }}
+    runs-on: ubuntu-24.04
+    container:
+      image: ghcr.io/bemanproject/testingcontainers-${{ matrix.config.tag }}
     strategy:
       fail-fast: false
       matrix:
         config:
-          - {name: "Ubuntu Clang 21", os: ubuntu-24.04, toolchain: "clang-21", clang_version: 21, installed_clang_version: 17, cmake_args: "-G \"Ninja Multi-Config\" -DCMAKE_CONFIGURATION_TYPES=\"RelWithDebInfo;Asan\" "}
-          - {name: "Ubuntu Clang 20", os: ubuntu-24.04, toolchain: "clang-20", clang_version: 20, installed_clang_version: 17, cmake_args: "-G \"Ninja Multi-Config\" -DCMAKE_CONFIGURATION_TYPES=\"RelWithDebInfo;Asan\" "}
+          - {name: "Ubuntu Clang 21", tag: "clang:21", toolchain: "clang-21", cmake_args: "-G \"Ninja Multi-Config\" -DCMAKE_CONFIGURATION_TYPES=\"RelWithDebInfo;Asan\" "}
+          - {name: "Ubuntu Clang 20", tag: "clang:20", toolchain: "clang-20", cmake_args: "-G \"Ninja Multi-Config\" -DCMAKE_CONFIGURATION_TYPES=\"RelWithDebInfo;Asan\" "}
           # Note: clang-19 + Asan setup causes errors on some platforms. Temporary skip some checks via .asan_options.
-          - {name: "Ubuntu Clang 19", os: ubuntu-24.04, toolchain: "clang-19", clang_version: 19, installed_clang_version: 17, cmake_args: "-G \"Ninja Multi-Config\" -DCMAKE_CONFIGURATION_TYPES=\"RelWithDebInfo;Asan\" ", asan_options: "new_delete_type_mismatch=0"}
-          - {name: "Ubuntu Clang 18", os: ubuntu-24.04, toolchain: "clang-18", clang_version: 18, installed_clang_version: 17, cmake_args: "-G \"Ninja Multi-Config\" -DCMAKE_CONFIGURATION_TYPES=\"RelWithDebInfo;Asan\" "}
-          - {name: "Ubuntu Clang 17", os: ubuntu-24.04, toolchain: "clang-17", clang_version: 17, installed_clang_version: 17, cmake_args: "-G \"Ninja Multi-Config\" -DCMAKE_CONFIGURATION_TYPES=\"RelWithDebInfo;Asan\" "}
-          - {name: "Ubuntu GCC 14", os: ubuntu-24.04, toolchain: "gcc-14", cmake_args: "-G \"Ninja Multi-Config\" -DCMAKE_CONFIGURATION_TYPES=\"RelWithDebInfo;Asan;Gcov\" ", coverage: true}
-          - {name: "Ubuntu GCC 13", os: ubuntu-24.04, toolchain: "gcc-13",  cmake_args: "-G \"Ninja Multi-Config\" -DCMAKE_CONFIGURATION_TYPES=\"RelWithDebInfo;Asan\" "}
-          - {name: "Ubuntu GCC 12", os: ubuntu-24.04, toolchain: "gcc-12",  cmake_args: "-G \"Ninja Multi-Config\" -DCMAKE_CONFIGURATION_TYPES=\"RelWithDebInfo;Asan\" "}
+          - {name: "Ubuntu Clang 19", tag: "clang:19", toolchain: "clang-19", cmake_args: "-G \"Ninja Multi-Config\" -DCMAKE_CONFIGURATION_TYPES=\"RelWithDebInfo;Asan\" ", asan_options: "new_delete_type_mismatch=0"}
+          - {name: "Ubuntu Clang 18", tag: "clang:18", toolchain: "clang-18", cmake_args: "-G \"Ninja Multi-Config\" -DCMAKE_CONFIGURATION_TYPES=\"RelWithDebInfo;Asan\" "}
+          - {name: "Ubuntu Clang 17", tag: "clang:17", toolchain: "clang-17", cmake_args: "-G \"Ninja Multi-Config\" -DCMAKE_CONFIGURATION_TYPES=\"RelWithDebInfo;Asan\" "}
+          - {name: "Ubuntu GCC 14", tag: "gcc:14", toolchain: "gcc-14", cmake_args: "-G \"Ninja Multi-Config\" -DCMAKE_CONFIGURATION_TYPES=\"RelWithDebInfo;Asan;Gcov\" ", coverage: true}
+          - {name: "Ubuntu GCC 13", tag: "gcc:13", toolchain: "gcc-13",  cmake_args: "-G \"Ninja Multi-Config\" -DCMAKE_CONFIGURATION_TYPES=\"RelWithDebInfo;Asan\" "}
+          - {name: "Ubuntu GCC 12", tag: "gcc:12", toolchain: "gcc-12",  cmake_args: "-G \"Ninja Multi-Config\" -DCMAKE_CONFIGURATION_TYPES=\"RelWithDebInfo;Asan\" "}
     steps:
       - uses: actions/checkout@v3
         with:
           submodules: 'true'
-      - uses: seanmiddleditch/gha-setup-ninja@master
-      - name: Activate verbose shell
-        run: set -x
-      - name: Install LLVM+Clang
-        if: startsWith(matrix.config.name, 'Ubuntu Clang')
+        # If Clang 17, install a newer version of libc++ and libc++abi.
+      - name: Install libc++
+        if: matrix.config.tag == 'clang:17'
         run: |
           set -x
-          cat /etc/lsb-release
-          # Remove existing Clang installations.
-          sudo apt-get remove \
-            clang-${{matrix.config.installed_clang_version}} \
-            clang++-${{matrix.config.installed_clang_version}} \
-            clangd-${{matrix.config.installed_clang_version}} \
-            clang-tidy-${{matrix.config.installed_clang_version}} \
-            clang-format-${{matrix.config.installed_clang_version}} \
-            clang-tools-${{matrix.config.installed_clang_version}} \
-            llvm-${{matrix.config.installed_clang_version}}-dev \
-            lld-${{matrix.config.installed_clang_version}} \
-            lldb-${{matrix.config.installed_clang_version}} \
-            llvm-${{matrix.config.installed_clang_version}}-tools \
-            libc++-${{matrix.config.installed_clang_version}}-dev \
-            libc++abi-${{matrix.config.installed_clang_version}}-dev \
-            libclang-common-${{matrix.config.installed_clang_version}}-dev \
-            libclang-${{matrix.config.installed_clang_version}}-dev \
-            libclang-cpp${{matrix.config.installed_clang_version}}-dev \
-            libomp-${{matrix.config.installed_clang_version}}-dev \
-            libunwind-${{matrix.config.installed_clang_version}}-dev \
-            libc++-dev libc++1 libc++abi-dev libc++abi1
-          # Install LLVM+Clang.
-          CLANG_VERSION=$(echo ${{matrix.config.toolchain}} | cut -d '-' -f2)
-          wget https://apt.llvm.org/llvm.sh
-          chmod +x llvm.sh
-          sudo ./llvm.sh ${CLANG_VERSION} all
-          # Link Clang libraries (if not done by llvm.sh - some links are already set).
-          sudo ln -fs /usr/lib/llvm-${CLANG_VERSION}/lib/lib* /usr/lib/x86_64-linux-gnu/ || true
-          # If Clang 17, install a newer version of libc++ and libc++abi.
-          [[ ${CLANG_VERSION} = 17 ]] && sudo apt-get install libc++-dev libc++1 libc++abi-dev libc++abi1
+          sudo apt-get install -y libc++-dev libc++1 libc++abi-dev libc++abi1
           find /usr/lib/x86_64-linux-gnu/ -name libc++.so* || true
-          clang++-${CLANG_VERSION} --version
-      - name: Install GCC
-        if: startsWith(matrix.config.name, 'Ubuntu GCC')
-        run: |
-          set -x
-          # Remove existing GCC installations.
-          sudo apt-get remove gcc-13 g++-13 gcc-14 g++-14 gcc g++
-          sudo apt update
-          # Install GCC.
-          GCC_VERSION=$(echo ${{matrix.config.toolchain}} | cut -d '-' -f2)
-          echo "GCC_VERSION=$GCC_VERSION"
-          sudo apt-get install g++-${GCC_VERSION} gcc-${GCC_VERSION}
-          find /usr/lib/x86_64-linux-gnu/ -name libstdc++.so*
-          g++-${GCC_VERSION} --version
       - name: Install Gcovr
         if: matrix.config.coverage
         run: |
           set -x
-          sudo apt-get install gcovr
+          sudo apt-get install -y gcovr
       - name: CMake Configure
         run: |
           set -x
@@ -142,7 +99,7 @@ jobs:
         if: matrix.config.coverage
         uses: coverallsapp/github-action@main
         with:
-          file: ${{runner.workspace}}/optional/.build/coverage.json
+          file: .build/coverage.json
           github-token: ${{ secrets.GITHUB_TOKEN }}
 
   create-issue-when-fault: