Activate caching and remove YAML devops nonsense

* Activates ccache for continuous-integration
* Moves all CI code into a file .github/continuous-integration.sh

.github/continuous-integration.sh

@@ -0,0 +1,41 @@
+#!/bin/bash
+
+set -e # Terminates as soon as something fails
+
+export PATH="$A2M_BUILD/llvm-build/bin:$PATH"
+
+function run-step {
+    echo "Running $@"
+    "$@"
+}
+
+if [[ -d "${PERSIST_DIR}/ccache-cachedir" ]]; then
+    echo "The Ccache directory exists at ${PERSIST_DIR}/ccache-cachedir"
+else
+    echo "Creating Ccache directory at ${PERSIST_DIR}/ccache-cachedir"
+    mkdir -p ${PERSIST_DIR}/ccache-cachedir
+    envsubst > ${PERSIST_DIR}/ccache-config <<EOF
+    max_size = 20G
+    cache_dir = ${PERSIST_DIR}/ccache-cachedir
+EOF
+fi
+
+(
+    run-step cd arc-mlir
+    A2M_CCACHE="1" BUILD_FLAVOUR=Release A2M_ASSERTS="1" run-step ./arc-mlir-build
+    run-step ninja -C $A2M_BUILD/llvm-build/ check-arc-mlir
+)
+
+(
+    run-step cd arc-script
+    run-step cargo insta test --package=arc-script-test-compile
+    run-step cargo insta accept
+    run-step cargo clippy
+    run-step cargo check
+    run-step cargo check --bins
+    run-step cargo check --tests
+    run-step cargo check --examples
+    run-step cargo check --benches
+    run-step cargo fuzz run parse -- -runs=10000 -only-ascii
+    # run-step cargo fmt -- -v --check
+)

.github/workflows/test.yml

@@ -4,13 +4,15 @@ on:
   pull_request:
     branches: [ master ]
 
-env:
-  CARGO_TERM_COLOR: always
-
 jobs:
   build:
     runs-on: self-hosted
 
+    env:
+      CARGO_TERM_COLOR: always
+      CCACHE_CONFIGPATH: /root/actions-runner/persist/ccache-config
+      PERSIST_DIR: /root/actions-runner/persist/
+
     steps:
 
       # Checkout branch which we want to test
@@ -21,32 +23,10 @@ jobs:
     - name: Update submodule
       run: git submodule update --init --recursive
 
-    - name: Update system path
-      run: echo "$A2M_BUILD/llvm-build/bin/" >> $GITHUB_PATH
-      env:
-        A2M_BUILD: ${{ format('{0}/build', runner.temp) }}
-
-      # Arc-MLIR specific tests
-    - name: Build and test arc-mlir
-      run: |
-        cd arc-mlir
-        ./arc-mlir-build
-        ninja tools/arc-mlir/arc-check -C $A2M_BUILD/llvm-build/
-        cd ../arc-script
-        cargo insta test --package=arc-script-test-compile
-        cargo insta accept
-        cargo clippy
-        cargo check
-        cargo check --bins
-        cargo check --tests
-        cargo check --examples
-        cargo check --benches
-        cargo fuzz run parse -- -runs=10000 -only-ascii
-        # cargo fmt -- -v --check
+    - name: Execute CI
+      run: ./.github/continuous-integration.sh
       env:
         A2M_BUILD: ${{ format('{0}/build', runner.temp) }}
 
     - name: Check for dirty tree
-      run: |
-        ./check-for-dirty-tree
-
+      run: ./check-for-dirty-tree