Add HTTPS_PROXY environment variable and refine condition for Docker release step in Actions workflow

.gitea/workflows/update.yaml

@@ -18,6 +18,7 @@ jobs:
     runs-on: ubuntu-24.04
     env:
       DEBUG: "@actions/http-client,request"
+      HTTPS_PROXY: http://localhost:8080
     steps:
       - name: Get latest homebrewery release
         id: latest_release
@@ -29,7 +30,7 @@ jobs:
 
       - name: Create Docker Release
         uses: softprops/action-gh-release@v2
-        if: ${{ !steps.latest_release.draft }}
+        if: ${{ steps.latest_release.id && !steps.latest_release.draft }}
         with:
           prerelease: ${{ steps.latest_release.prerelease }}
           name: ${{ steps.latest_release.name }}