fix: compute PACK_VERSION in bash (env: did not expand $(date), caused invalid tag -> 500)

.gitea/workflows/pack.yaml

@@ -23,7 +23,6 @@ jobs:
       GITEA_API: ${{ gitea.api_url }}
       GITEA_REPO: ${{ gitea.repository }}
       TOKEN: ${{ secrets.GITEA_TOKEN }}
-      PACK_VERSION: pack-$(date +%Y%m%d-%H%M)
       FORCE: ${{ github.event.inputs.force }}
       CACHE_DIR: /var/tmp/pack-cache
     steps:
@@ -75,10 +74,12 @@ jobs:
         run: |
           set -e
           exec 2>&1
+          export PACK_VERSION="pack-$(date +%Y%m%d-%H%M)"
           echo "=== Building site pack ${PACK_VERSION} ==="
           WORK="/tmp/pack-build"
           rm -rf "$WORK" && mkdir -p "$WORK/src" "$WORK/out" "$CACHE_DIR"
           echo "WORK=$WORK" >> "$GITHUB_ENV"
+          echo "PACK_VERSION=$PACK_VERSION" >> "$GITHUB_ENV"
 
       # ---- Per-component: pull only if ref changed, reuse cached build otherwise ----
       - name: CMS (this repo)