[bcc test] Simplify workflow

During the bcc-test workflow, we do not really need `installed_llvm_versions`
as we only need to build the ephemeral container for the llvm version we are testing
(e.g matrix.llvm_version).
This container is only built IFF a docker file is changed in order to make
sure the PR runs on a container which has the changes from the docker file.
At the end of the day, the container that we use only needs 1 llvm version installed,
the one we test.

.github/workflows/bcc-test.yml

@@ -21,7 +21,7 @@ jobs:
  runs-on: ubuntu-20.04
  strategy:
  matrix:
- os: [{distro: "ubuntu", version: "18.04", nick: bionic, installed_llvm_versions: "11 12"}, {distro: "ubuntu", version: "20.04", nick: focal, installed_llvm_versions: "11 12 15"}]
+ os: [{distro: "ubuntu", version: "18.04", nick: bionic}, {distro: "ubuntu", version: "20.04", nick: focal}]
  llvm_version: [11, 12, 15]
  env:
  - TYPE: Debug
@@ -34,7 +34,7 @@ jobs:
  PYTHON_TEST_LOGFILE: critical.log
  RW_ENGINE_ENABLED: ON
  exclude:
- - os: {distro: "ubuntu", version: "18.04", nick: bionic, installed_llvm_versions: "11 12"}
+ - os: {distro: "ubuntu", version: "18.04", nick: bionic}
  llvm_version: 15
  steps:
  - uses: actions/checkout@v2
@@ -59,7 +59,7 @@ jobs:
  os_distro: ${{ matrix.os.distro }}
  os_version: ${{ matrix.os.version }}
  os_nick: ${{ matrix.os.nick }}
- llvm_versions: ${{ matrix.os.installed_llvm_versions }}
+ llvm_versions: ${{ matrix.llvm_version }}
  - name: Tag docker container
  run: |
  docker tag ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ matrix.os.distro }}-${{ matrix.os.version }} bcc-docker