docs: update references to github's package registry host

.github/workflows/push.yml

@@ -11,7 +11,7 @@ jobs:
       - name: GitHub Package Registry
         uses: aevea/action-kaniko@master
         with:
-          registry: docker.pkg.github.com
+          registry: ghcr.io
           password: ${{ secrets.GITHUB_TOKEN }}
           image: kaniko
           cache: true

.github/workflows/release.yml

@@ -22,7 +22,7 @@ jobs:
       - name: GitHub Package Registry
         uses: aevea/action-kaniko@master
         with:
-          registry: docker.pkg.github.com
+          registry: ghcr.io
           password: ${{ secrets.GITHUB_TOKEN }}
           image: kaniko
           cache: true

README.md

@@ -83,7 +83,7 @@ with:
   cache_registry: aevea/cache
 ```
 
-### [docker.pkg.github.com](https://github.com/features/packages)
+### [ghcr.io](https://github.com/features/packages)
 
 GitHub's docker registry is a bit special. It doesn't allow top-level images, so this action will prefix any image with the GitHub namespace.
 If you want to push your image like `aevea/action-kaniko/kaniko`, you'll only need to pass `kaniko` to this action.
@@ -93,7 +93,7 @@ passed by default, it will have to be explicitly set up.
 
 ```yaml
 with:
-  registry: docker.pkg.github.com
+  registry: ghcr.io
   password: ${{ secrets.GITHUB_TOKEN }}
   image: kaniko
 ```
@@ -104,7 +104,7 @@ cache layers to that image instead
 
 ```yaml
 with:
-  registry: docker.pkg.github.com
+  registry: ghcr.io
   password: ${{ secrets.GITHUB_TOKEN }}
   image: kaniko
   cache: true
@@ -167,7 +167,7 @@ Example:
 
 ```yaml
 with:
-  registry: docker.pkg.github.com
+  registry: ghcr.io
   password: ${{ secrets.GITHUB_TOKEN }}
   image: kaniko
   strip_tag_prefix: pre-

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)