Implement github actions cache, for docker build (#2727)

Author: boc-the-git

.github/workflows/partial-builder.yml

@@ -46,3 +46,6 @@ jobs:
           tags: ghcr.io/${{ github.repository }}:${{ inputs.tag }}
           build-args: |
             COMMIT=${{ github.sha }}
+          # https://docs.docker.com/build/ci/github-actions/cache/#github-cache
+          cache-from: type=gha
+          cache-to: type=gha,mode=max