Update GitHub Actions to use new bashbrew action

This should fix errors that the old code would've run into thanks to the update to Go 1.18, and should help prevent them in the future by pinning to a specific release of both Bashbrew and the related scripts.

.github/workflows/images.yml

@@ -20,22 +20,22 @@ jobs:
     outputs:
       strategy: ${{ steps.generate-jobs.outputs.strategy }}
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
+      - uses: docker-library/bashbrew@v0.1.5
       - id: generate-jobs
         name: Generate Jobs
         run: |
-          git clone --depth 1 https://github.com/docker-library/bashbrew.git -b master ~/bashbrew
-          strategy="$(GITHUB_REPOSITORY=friendica ~/bashbrew/scripts/github-actions/generate.sh)"
-          strategy="$(~/bashbrew/scripts/github-actions/munge-i386.sh -c <<<"$strategy")"
+          strategy="$(GITHUB_REPOSITORY=friendica "$BASHBREW_SCRIPTS/github-actions/generate.sh")"
+          strategy="$("$BASHBREW_SCRIPTS/github-actions/munge-i386.sh" -c <<<"$strategy")"
+          echo "strategy=$strategy" >> "$GITHUB_OUTPUT"
           jq . <<<"$strategy" # sanity check / debugging aid
-          echo "::set-output name=strategy::$strategy"
   test:
     needs: generate-jobs
     strategy: ${{ fromJson(needs.generate-jobs.outputs.strategy) }}
     name: ${{ matrix.name }}
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Prepare Environment
         run: ${{ matrix.runs.prepare }}
       - name: Run update.sh script