ci: retry transient Zot registry errors [CI SKIP]

ci/release-linux.sh

@@ -42,11 +42,33 @@ cp -a "$output/." "$container_context/app/"
 
 export REGISTRY_AUTH_FILE="$root/.release/auth/zot-linux-$arch.json"
 mkdir -p "$(dirname "$REGISTRY_AUTH_FILE")"
-buildah login --tls-verify=false --username "$ZOT_USERNAME" --password-stdin "$registry" <<< "$ZOT_PASSWORD" >/dev/null
+logged_in=false
+for attempt in 1 2 3 4; do
+  if buildah login --tls-verify=false --username "$ZOT_USERNAME" --password-stdin "$registry" <<< "$ZOT_PASSWORD" >/dev/null; then
+    logged_in=true
+    break
+  fi
+  if [[ "$attempt" -lt 4 ]]; then
+    echo "Zot login attempt $attempt failed; retrying in 3 seconds" >&2
+    sleep 3
+  fi
+done
+[[ "$logged_in" == true ]] || { echo "could not authenticate to Zot after 4 attempts" >&2; exit 1; }
 local_image="localhost/monitor-backend:$version-$arch"
 buildah bud --tls-verify=false --arch "$arch" \
   --build-arg "APP_VERSION=$version" \
   -f "$root/packaging/container/Backend.Containerfile" \
   -t "$local_image" "$container_context" >/dev/null
-buildah push --tls-verify=false "$local_image" "docker://$image:$version-$arch" >/dev/null
+pushed=false
+for attempt in 1 2 3; do
+  if buildah push --tls-verify=false "$local_image" "docker://$image:$version-$arch" >/dev/null; then
+    pushed=true
+    break
+  fi
+  if [[ "$attempt" -lt 3 ]]; then
+    echo "Zot push attempt $attempt failed; retrying in 5 seconds" >&2
+    sleep 5
+  fi
+done
+[[ "$pushed" == true ]] || { echo "could not push image to Zot after 3 attempts" >&2; exit 1; }
 echo "pushed Zot image $image:$version-$arch"