Make it possible to disable image push

bin/build

@@ -1,15 +1,22 @@
 #!/usr/bin/env bash
 
 main() {
-    set -eux
+    set -eu
 
     docker build -t "${XCR_REGISTRY:?}/n0rthernl1ghts/gha-runner-kms:latest" .
 
     local git_hash
     git_hash="$(git rev-parse --verify HEAD)"
     docker tag "${XCR_REGISTRY:?}/n0rthernl1ghts/gha-runner-kms:latest" "${XCR_REGISTRY:?}/n0rthernl1ghts/gha-runner-kms:git-${git_hash}"
+
+    local enable_push="${1:-1}"
+    if [[ "${enable_push}" -ne 1 ]]; then
+        echo "Push is disabled."
+        return
+    fi
+
     docker push "${XCR_REGISTRY}/n0rthernl1ghts/gha-runner-kms:latest"
     docker push "${XCR_REGISTRY}/n0rthernl1ghts/gha-runner-kms:git-${git_hash}"
 }
 
-main
+main "${@}"