Use new "bashbrew" composite action

Author: tianon

.github/workflows/ci.yml

@@ -21,11 +21,11 @@ jobs:
       strategy: ${{ steps.generate-jobs.outputs.strategy }}
     steps:
       - uses: actions/checkout@v3
+      - uses: docker-library/bashbrew@HEAD
       - id: generate-jobs
         name: Generate Jobs
         run: |
-          git clone --depth 1 https://github.com/docker-library/bashbrew.git -b master ~/bashbrew
-          strategy="$(GENERATE_STACKBREW_LIBRARY='.github/workflows/fake-gsl.sh' ~/bashbrew/scripts/github-actions/generate.sh)"
+          strategy="$(GENERATE_STACKBREW_LIBRARY='.github/workflows/fake-gsl.sh' "$BASHBREW_SCRIPTS/github-actions/generate.sh")"
           strategy="$(.github/workflows/munge-build.sh -c <<<"$strategy")"
           strategy="$(.github/workflows/munge-debian-unstable.sh -c <<<"$strategy")"
           echo "strategy=$strategy" >> "$GITHUB_OUTPUT"