Fix pipeline (disable docker job when running on a PR from a forked repo)

.github/workflows/pipeline.yml

@@ -140,21 +140,21 @@ jobs:
       - name: Set up Docker Buildx
         id: buildx
         uses: crazy-max/ghaction-docker-buildx@v1
-        if: ${{env.DOCKER_IMAGE}} != ''
+        if: env.DOCKER_IMAGE != ''
         with:
           version: latest
 
       - uses: actions/checkout@v1
-        if: ${{env.DOCKER_IMAGE}} != ''
+        if: env.DOCKER_IMAGE != ''
 
       - uses: actions/download-artifact@v1
-        if: ${{env.DOCKER_IMAGE}} != ''
+        if: env.DOCKER_IMAGE != ''
         with:
           name: binaries
           path: dist
 
       - name: Build the Docker image and push
-        if: ${{env.DOCKER_IMAGE}} != ''
+        if: env.DOCKER_IMAGE != ''
         env:
           DOCKER_IMAGE: ${{secrets.DOCKER_IMAGE}}
           DOCKER_PLATFORM: linux/amd64,linux/arm/v7,linux/arm64