ci: build multistage Docker image instead of download version

.github/workflows/docker.yml

@@ -3,30 +3,30 @@ name: Build Docker images
 on: push
 
 jobs:
-  build_from_download:
-    runs-on: ubuntu-22.04
-    steps:
-      # Checks-out the repository under $GITHUB_WORKSPACE.
-      - uses: actions/checkout@v4
-      - name: Build Dockerfile_download
-        run: |
-          cd docker
-          docker build . -f Dockerfile_download
-#  build_single_stage:
+#  build_from_download:
 #    runs-on: ubuntu-22.04
 #    steps:
 #      # Checks-out the repository under $GITHUB_WORKSPACE.
 #      - uses: actions/checkout@v4
-#      - name: Build Dockerfile_build
+#      - name: Build Dockerfile_download
 #        run: |
 #          cd docker
-#          docker build . -f Dockerfile_build
-#  build_multiple_stages:
+#          docker build . -f Dockerfile_download
+#  build_single_stage:
 #    runs-on: ubuntu-22.04
 #    steps:
 #      # Checks-out the repository under $GITHUB_WORKSPACE.
 #      - uses: actions/checkout@v4
-#      - name: Build Dockerfile_multistage_build
+#      - name: Build Dockerfile_build
 #        run: |
 #          cd docker
-#          docker build . -f Dockerfile_multistage_build
+#          docker build . -f Dockerfile_build
+  build_multiple_stages:
+    runs-on: ubuntu-22.04
+    steps:
+      # Checks-out the repository under $GITHUB_WORKSPACE.
+      - uses: actions/checkout@v4
+      - name: Build Dockerfile_multistage_build
+        run: |
+          cd docker
+          docker build . -f Dockerfile_multistage_build