ci(release): fix env var names for act_runner compatibility

gitea act_runner exposes GITHUB_* not GITEA_* variable aliases;
switch to GITHUB_REF_NAME and GITHUB_OUTPUT so tag extraction works.

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

.gitea/workflows/release.yml

@@ -16,13 +16,13 @@ jobs:
         id: meta
         shell: bash
         run: |
-          VERSION="${GITEA_REF_NAME#v}"
+          VERSION="${GITHUB_REF_NAME#v}"
           MAJOR_MINOR="$(printf '%s' "$VERSION" | awk -F. '{print $1"."$2}')"
           {
             echo "version=$VERSION"
             echo "major_minor=$MAJOR_MINOR"
             echo "image=registry.ginnoir.com/ginnoir/famapp"
-          } >> "$GITEA_OUTPUT"
+          } >> "$GITHUB_OUTPUT"
 
       - name: Install docker
         run: apt-get update -qq && apt-get install -y -qq docker.io