Build all five G15 packages and add native Gitea push CI

packaging/run.sh

@@ -10,7 +10,7 @@ image=${G15_BUILD_IMAGE:-g15-packaging}
 docker build -t "$image" -f "$root/packaging/Dockerfile" "$root/packaging"
 # Allowlist mounts: .vscode and other unrelated local files are not exposed.
 mounts=()
-for path in .git .gitmodules packaging libg15 libg15render g15daemon g15macro; do
+for path in .git .gitmodules packaging libg15 libg15render g15daemon g15macro g15stats; do
     mounts+=(--mount "type=bind,src=$root/$path,dst=/work/$path,readonly")
 done
 docker run --rm "${mounts[@]}" --mount "type=bind,src=$out,dst=/out" "$image"