fix: derive registry host from gitea.server_url instead of unset variable

REGISTRY_URL var was empty so docker login fell through to Docker Hub.
Now strips protocol from gitea.server_url to get the registry hostname —
no manual variable needed. docker-compose defaults to the known host.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/deploy.yml

@@ -12,19 +12,23 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Set image name
+      - name: Set image tags
         id: image
         run: |
-          IMAGE="${{ vars.REGISTRY_URL }}/josh/sixflagssupercalendar"
-          SHA="${{ github.sha }}"
-          echo "full=${IMAGE}" >> "$GITHUB_OUTPUT"
+          # Gitea's container registry lives on the same host as the Gitea instance
+          REGISTRY="${{ gitea.server_url }}"
+          REGISTRY="${REGISTRY#https://}"
+          REGISTRY="${REGISTRY#http://}"
+          IMAGE="${REGISTRY}/josh/sixflagssupercalendar"
+          SHA="${{ gitea.sha }}"
+          echo "registry=${REGISTRY}" >> "$GITHUB_OUTPUT"
           echo "tag_latest=${IMAGE}:latest" >> "$GITHUB_OUTPUT"
           echo "tag_sha=${IMAGE}:${SHA::8}" >> "$GITHUB_OUTPUT"
 
       - name: Log in to registry
         run: |
           echo "${{ secrets.REGISTRY_TOKEN }}" | \
-            docker login "${{ vars.REGISTRY_URL }}" -u josh --password-stdin
+            docker login "${{ steps.image.outputs.registry }}" -u josh --password-stdin
 
       - name: Build image
         run: |

README.md

@@ -122,10 +122,11 @@ The pipeline is defined at [`.gitea/workflows/deploy.yml`](.gitea/workflows/depl
 
 | Type | Name | Value |
 |------|------|-------|
-| Variable | `REGISTRY_URL` | Your registry host, e.g. `gitea.example.com` |
 | Secret | `REGISTRY_TOKEN` | A Gitea access token with `package:write` scope |
 
-Set these under **Repository → Settings → Actions → Variables / Secrets**.
+Set this under **Repository → Settings → Actions → Secrets**.
+
+The registry host is derived automatically from `gitea.server_url` — no `REGISTRY_URL` variable needed.
 
 #### Upstream remote
 

docker-compose.yml

@@ -1,6 +1,6 @@
 services:
   web:
-    image: ${REGISTRY_URL}/josh/sixflagssupercalendar:latest
+    image: ${REGISTRY_URL:-gitea.thewrightserver.net}/josh/sixflagssupercalendar:latest
     build:
       context: .
       dockerfile: Dockerfile