Update docker/build-push-action action to v2.8.0

Author: renovate-bot

.github/workflows/ci.yml

@@ -27,7 +27,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Build base
-        uses: docker/build-push-action@a66e35b9cbcf4ad0ea91ffcaf7bbad63ad9e0229 # renovate: tag=v2.7.0
+        uses: docker/build-push-action@1814d3dfb36d6f84174e61f4a4b05bd84089a4b9 # renovate: tag=v2.8.0
         with:
           context: .devcontainer
           build-args: |
@@ -81,7 +81,7 @@ jobs:
         uses: docker/setup-buildx-action@94ab11c41e45d028884a99163086648e898eed25 # renovate: tag=v1.6.0
 
       - name: Build (and, if a release, push to Docker Hub)
-        uses: docker/build-push-action@a66e35b9cbcf4ad0ea91ffcaf7bbad63ad9e0229 # renovate: tag=v2.7.0
+        uses: docker/build-push-action@1814d3dfb36d6f84174e61f4a4b05bd84089a4b9 # renovate: tag=v2.8.0
         with:
           context: .devcontainer
           tags: ${{ github.repository }}:1-bullseye