Try warming up the bazel cache before testing

Author: cbandera

.github/workflows/build.yml

@@ -49,6 +49,11 @@ jobs:
           bazelisk-cache: true
           disk-cache: false
           repository-cache: false
+          module-root: ${{ github.workspace }}/test/bazel_workspace
+
+      - name: Build Bazel workspace to assure it is working & warm up cache
+        run: bazel build //...
+        working-directory: ${{ github.workspace }}/test/bazel_workspace/
 
       - run: xvfb-run -a npm test
         if: runner.os == 'Linux'

test/bazel_workspace/.bazelversion

@@ -0,0 +1 @@
+8.3.1

test/bazel_workspace/pkg1/BUILD

@@ -5,5 +5,5 @@ py_binary(
 )
 filegroup(
     name="foo",
-    srcs=["foobar.txt"],
+    srcs=["subfolder/foo.txt"],
 )