Provide outputs as env vars

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

.github/workflows/ci.yml

@@ -37,6 +37,9 @@ jobs:
             type=ref,event=tag
             type=ref,event=pr
             type=sha
+      -
+        name: Print envs
+        run: env|sort
 
   tag-schedule:
     runs-on: ubuntu-latest
@@ -224,6 +227,14 @@ jobs:
           echo "version=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.version'] }}"
           echo "revision=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.revision'] }}"
           echo "created=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.created'] }}"
+      -
+        name: JSON build arg
+        uses: docker/build-push-action@v3
+        with:
+          context: ./test
+          file: ./test/json.Dockerfile
+          build-args: |
+            BUILDINFO=${{ steps.meta.outputs.json }}
 
   docker-push:
     runs-on: ubuntu-latest
@@ -350,3 +361,31 @@ jobs:
         with:
           script: |
             console.log(`${{ steps.meta.outputs.tags }}`);
+
+  output-env:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v3
+      -
+        name: Docker meta
+        id: meta
+        uses: ./
+        with:
+          images: |
+            ${{ env.DOCKER_IMAGE }}
+            ghcr.io/name/app
+          labels: |
+            maintainer=CrazyMax
+      -
+        name: Build
+        uses: docker/build-push-action@v3
+        with:
+          context: ./test
+          file: ./test/output.Dockerfile
+          build-args: |
+            DOCKER_METADATA_OUTPUT_VERSION
+            DOCKER_METADATA_OUTPUT_TAGS
+            DOCKER_METADATA_OUTPUT_LABELS
+            DOCKER_METADATA_OUTPUT_JSON