add CI images to repo

.forgejo/workflows/images.yaml

@@ -0,0 +1,19 @@
+on: [push]
+jobs:
+  check:
+    runs-on: nix-upstream-latest
+    permissions:
+      id-token: "write"
+      contents: "read"
+    steps:
+      - run: echo "experimental-features = nix-command flakes" >> /etc/nix/nix.conf
+      - run: nix-env -i nodejs skopeo # bootstrap
+      - uses: actions/checkout@v4
+      - run: mkdir -p /etc/containers && cp .forgejo/default-policy.json /etc/containers/policy.json
+      - run: |-
+          for line in $(cat .forgejo/tags.txt); do
+            IFS=: read -r pkg tag <<< $line
+            cp $(nix build .#$pkg --print-out-paths) /tmp/img.tar.gz
+            gunzip /tmp/img.tar.gz
+            skopeo copy --dest-creds="${{ secrets.FJ_USER }}:${{ secrets.FJ_PASS }}" docker-archive:///tmp/img.tar docker://git.10110110.xyz/ci/$tag:latest
+          done