Docker build caching, cleanup

.github/workflows/pr.yml

@@ -22,6 +22,17 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v2
 
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Cache Docker layers
+        uses: actions/cache@v2
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-
+
       - name: Log in to the Container registry
         uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
         with:
@@ -42,6 +53,8 @@ jobs:
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,dest=/tmp/.buildx-cache-new
 
   deploy:
     name: Deploy
@@ -80,11 +93,16 @@ jobs:
       name: dev
     steps:
       - uses: actions/checkout@v2
-      - name: Cleanup
+      - name: Remove OpenShift artifacts
         run: |
           set -ex
           oc login --token=${{ secrets.OC_TOKEN }} --server=${{ secrets.OC_SERVER }}
           oc project ${{ secrets.NAMESPACE }}
 
           # Remove old build runs, build pods and deployment pods
           oc delete all -l app=gfp-${{ github.event.number }}
+
+      - name: Remove Docker cache
+        run: |
+          rm -rf /tmp/.buildx-cache
+          mv /tmp/.buildx-cache-new /tmp/.buildx-cache