Remove redundant registry retrieval step and use environment variable directly in Docker workflow

Signed-off-by: Stephen Simpson <ssimpson89@users.noreply.github.com>

.gitea/workflows/docker-image-linux.yml

@@ -10,14 +10,11 @@ on:
   workflow_dispatch:
 
 env:
-  REGISTRY: gitea.sjs.io
   IMAGE_NAME: rocky-dev
 
 jobs:
   build-and-push:
     runs-on: ubuntu-latest
-    container:
-      image: gitea/runner-images:ubuntu-latest
 
     permissions:
       contents: read
@@ -36,7 +33,7 @@ jobs:
       - name: Log in to registry
         uses: docker/login-action@v3
         with:
-          registry: ${{ env.REGISTRY }}
+          registry: ${{ vars.REGISTRY }}
           username: ${{ vars.USERNAME }}
           password: ${{ secrets.PASS }}
 
@@ -44,7 +41,7 @@ jobs:
         id: meta
         uses: docker/metadata-action@v5
         with:
-          images: ${{ env.REGISTRY }}/${{ vars.USERNAME }}/${{ env.IMAGE_NAME }}
+          images: ${{ vars.REGISTRY }}/${{ vars.USERNAME }}/${{ env.IMAGE_NAME }}
           tags: |
             # Only tag with version and latest on tag push
             type=semver,pattern={{version}},enable=${{ startsWith(github.ref, 'refs/tags/') }}