ci: fix pipeline concurrency and target evaluation bugs

1. Added native Gitea/GitHub Actions concurrency group to automatically cancel outdated/stale deploy runs for the same branch (fixes 'alte deploys durchjagen'). 2. Replaced the buggy 'github.ref_type' condition with explicit 'github.ref' matching. Gitea often failed to populate ref_type, causing staging tags to be downgraded to 'branch' target, making them equal priority to feature branches where the newer run would win (fixes 'feature branches wichtiger als staging').

.gitea/workflows/deploy.yml

@@ -13,6 +13,10 @@ on:
         required: false
         default: 'false'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 env:
   PUPPETEER_SKIP_DOWNLOAD: "true"
   COREPACK_NPM_REGISTRY: "https://registry.npmmirror.com"
@@ -89,12 +93,12 @@ jobs:
           DOMAIN="e-tib.com"
           PRJ="etib"
 
-          if [[ "${{ github.ref_type }}" == "branch" && "$REF" == "main" ]]; then
+          if [[ "${{ github.ref }}" == "refs/heads/main" ]]; then
             TARGET="testing"
             IMAGE_TAG="main-${SHORT_SHA}"
             ENV_FILE=".env.testing"
             TRAEFIK_HOST="test.${DOMAIN}"
-          elif [[ "${{ github.ref_type }}" == "tag" ]]; then
+          elif [[ "${{ github.ref }}" == refs/tags/* ]]; then
             if [[ "$REF" =~ ^v[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
               TARGET="production"
               IMAGE_TAG="$REF"