fix: update github container registry host

entrypoint.sh

@@ -31,7 +31,7 @@ ensure "${IMAGE}" "image"
 ensure "${TAG}" "tag"
 ensure "${CONTEXT_PATH}" "path"
 
-if [ "$REGISTRY" == "docker.pkg.github.com" ]; then
+if [ "$REGISTRY" == "ghcr.io" ]; then
     IMAGE_NAMESPACE="$(echo $GITHUB_REPOSITORY | tr '[:upper:]' '[:lower:]')"
     export IMAGE="$IMAGE_NAMESPACE/$IMAGE"
     export REPOSITORY="$IMAGE_NAMESPACE/$REPOSITORY"
@@ -91,8 +91,8 @@ EOF
 if [ ! -z $INPUT_SKIP_UNCHANGED_DIGEST ]; then
     export DIGEST=$(cat digest)
 
-    if [ "$REGISTRY" == "docker.pkg.github.com" ]; then
-        wget -q -O manifest --header "Authorization: Basic $(echo -n $USERNAME:$PASSWORD | base64 | tr -d \\n)" https://docker.pkg.github.com/v2/$REPOSITORY/manifests/latest || true
+    if [ "$REGISTRY" == "ghcr.io" ]; then
+        wget -q -O manifest --header "Authorization: Basic $(echo -n $USERNAME:$PASSWORD | base64 | tr -d \\n)" https://ghcr.io/v2/$REPOSITORY/manifests/latest || true
         export REMOTE="sha256:$(cat manifest | sha256sum | awk '{ print $1 }')"
     else
         export REMOTE=$(reg digest -u $USERNAME -p $PASSWORD $REGISTRY/$REPOSITORY | tail -1)