fix branch and fetch stack details

.gitea/workflows/immich.yaml

@@ -18,7 +18,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
         with:
-          ref: stage
+          ref: main
 
       - name: Get the endpoint ID
       # Usually ID is 1, but you can get it from the API. Only skip this if you are VERY sure.
@@ -34,10 +34,16 @@ jobs:
           echo "STACK_ID=$STACK_ID" >> $GITHUB_ENV
           echo "Got stack ID: $STACK_ID matched with Endpoint ID: $ENDPOINT_ID"
 
+      - name: Fetch Stack
+        run: |
+          # Get the stack details (including stack file content)
+          curl -s -H "X-API-Key: $PORTAINER_TOKEN" "$PORTAINER_API_URL/stacks/$STACK_ID/file" \
+            | jq -r '.StackFileContent' > stack.yml
+
       - name: Update stack in Portainer
         run: |
           # Read stack file content
-          STACK_FILE_CONTENT=$(echo "$(<stage-compose.yml )")
+          STACK_FILE_CONTENT=$(echo "$(<stack.yml )")
 
           # Prepare JSON payload
           JSON_PAYLOAD=$(jq -n --arg stackFileContent "$STACK_FILE_CONTENT" --argjson pullImage true \