Use a full fetch in CI: Gitea fails to pack a shallow clone

actions/checkout defaults to depth=1, and Gitea aborted generating that pack
with a bad pack header protocol error on every retry, failing the run before
any image was built. Same fix already applied on the server repo; applied here
to all four workflows so the edge-node, op25 and icecast images can build.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

.gitea/workflows/build-edge-node.yml

@@ -16,7 +16,11 @@ jobs:
     env:
       CONTAINER_NAME: edge-node
     steps:
+      # Full fetch: Gitea fails to pack the default depth=1 shallow clone
+      # ("bad pack header"). Don't set this back to a shallow fetch.
       - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
 
       - uses: docker/setup-qemu-action@v3