Refactor Docker Hub username references in workflows to use vars instead of env

Author: thunder-spb

.github/workflows/deploy-image.yaml

@@ -26,7 +26,7 @@ jobs:
       - name: Login to DockerHub Container Registry
         uses: docker/login-action@v3
         with:
-          username: ${{ env.DH_USER }}
+          username: ${{ vars.DH_USER }}
           password: ${{ secrets.DH_TOKEN }}
 
       - name: Set up QEMU
@@ -40,7 +40,7 @@ jobs:
         uses: docker/metadata-action@v5
         with:
           images: |
-            ${{ env.DH_USER }}/${{ env.IMAGE_NAME }}
+            ${{ vars.DH_USER }}/${{ env.IMAGE_NAME }}
             ghcr.io/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}
           tags: |
             # production (i.e. 2.36+b1)

.github/workflows/sync-readme.yaml

@@ -21,9 +21,9 @@ jobs:
     - name: Docker Hub Description
       uses: peter-evans/dockerhub-description@v4
       with:
-        username: ${{ env.DH_USER }}
+        username: ${{ vars.DH_USER }}
         password: ${{ secrets.DH_TOKEN }}
-        repository: ${{ env.DH_USER }}/${{ env.IMAGE_NAME }}
+        repository: ${{ vars.DH_USER }}/${{ env.IMAGE_NAME }}
         readme-filepath: ./README.md
         short-description: ${{ github.event.repository.description }}
         enable-url-completion: true