Optimize docker buildx cache

.github/workflows/build-latest.yaml

@@ -59,6 +59,7 @@ jobs:
           context: .
           file: Dockerfile
           push: false
+          load: true
           tags: ${{ secrets.DOCKERHUB_REPO }}/postgis:base-${{ matrix.distro }}-${{ matrix.imageVersion }}-${{ matrix.imageVariant }}
           build-args: |
             DISTRO=${{ matrix.distro }}
@@ -69,7 +70,7 @@ jobs:
             POSTGIS_MAJOR_VERSION=${{ matrix.postgisMajorVersion }}
             POSTGIS_MINOR_VERSION=${{ matrix.postgresMinorVersion }}
           cache-from: type=local,src=/tmp/.buildx-cache
-          cache-to: type=local,dest=/tmp/.buildx-cache
+          cache-to: type=local,mode=max,dest=/tmp/.buildx-cache
           target: postgis-base
 
       - name: Build prod image
@@ -90,9 +91,30 @@ jobs:
             POSTGIS_MAJOR_VERSION=${{ matrix.postgisMajorVersion }}
             POSTGIS_MINOR_VERSION=${{ matrix.postgresMinorVersion }}
           cache-from: type=local,src=/tmp/.buildx-cache
-          cache-to: type=local,dest=/tmp/.buildx-cache
+          cache-to: type=local,mode=max,dest=/tmp/.buildx-cache
           target: postgis-prod
 
+      - name: Build image for testing
+        id: docker_build_testing_image
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: Dockerfile
+          push: false
+          load: true
+          tags: kartoza/postgis:manual-build
+          build-args: |
+            DISTRO=${{ matrix.distro }}
+            IMAGE_VERSION=${{ matrix.imageVersion }}
+            IMAGE_VARIANT=${{ matrix.imageVariant }}
+            GENERATE_ALL_LOCALE=0
+            POSTGRES_MAJOR_VERSION=${{ matrix.postgresMajorVersion }}
+            POSTGIS_MAJOR_VERSION=${{ matrix.postgisMajorVersion }}
+            POSTGIS_MINOR_VERSION=${{ matrix.postgresMinorVersion }}
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,mode=max,dest=/tmp/.buildx-cache
+          target: postgis-test
+
   run-scenario-tests:
     runs-on: ubuntu-latest
     needs: [ build-image ]
@@ -145,6 +167,7 @@ jobs:
             POSTGRES_MAJOR_VERSION=${{ matrix.postgresMajorVersion }}
             POSTGIS_MAJOR_VERSION=${{ matrix.postgisMajorVersion }}
             POSTGIS_MINOR_VERSION=${{ matrix.postgresMinorVersion }}
+          cache-from: type=local,src=/tmp/.buildx-cache
           target: postgis-test
 
       - name: Run scenario test