ci: persist Buildah cache for Linux releases

ci/release-linux.sh

@@ -40,6 +40,13 @@ find "$output" -type f -name '*.pdb' -delete
 cp -a "$output/." "$container_context/app/"
 : > "$container_context/data/.keep"
 
+# Woodpecker's local backend isolates HOME per workflow. Keep Buildah's image
+# store outside that temporary directory so the runtime base image is reusable
+# across releases. Separate stores avoid concurrent amd64/arm64 writers.
+buildah_home="/home/justme/woodpecker/buildah-home/$arch"
+mkdir -p "$buildah_home"
+export HOME="$buildah_home"
+
 export REGISTRY_AUTH_FILE="$root/.release/auth/zot-linux-$arch.json"
 mkdir -p "$(dirname "$REGISTRY_AUTH_FILE")"
 logged_in=false
@@ -58,10 +65,10 @@ local_image="localhost/monitor-backend:$version-$arch"
 buildah bud --tls-verify=true --arch "$arch" \
   --build-arg "APP_VERSION=$version" \
   -f "$root/packaging/container/Backend.Containerfile" \
-  -t "$local_image" "$container_context" >/dev/null
+  -t "$local_image" "$container_context"
 pushed=false
 for attempt in 1 2 3; do
-  if buildah push --tls-verify=true "$local_image" "docker://$image:$version-$arch" >/dev/null; then
+  if buildah push --tls-verify=true "$local_image" "docker://$image:$version-$arch"; then
     pushed=true
     break
   fi