Merge pull request #6 from bbednarek//issues/5

Download crane binary corresponding to underlying runner architecture

action.yml

@@ -35,10 +35,15 @@ runs:
       if [[ $os == "macOS" ]]; then
         os="Darwin"
       fi
+      
+      arch=$(uname -m)
+      if [[ "$arch" =~ (aarch64|arm64) ]] ; then
+        arch=arm64
+      fi  
 
       if [[ ! -z ${tag} ]]; then
-        echo "Installing crane @ ${tag} for ${os}"
-        curl -fsL https://github.com/google/go-containerregistry/releases/download/${tag}/go-containerregistry_${os}_x86_64.tar.gz | sudo tar xzf - -C /usr/local/bin crane
+        echo "Installing crane @ ${tag} for ${os} on ${arch}"
+        curl -fsL https://github.com/google/go-containerregistry/releases/download/${tag}/go-containerregistry_${os}_${arch}.tar.gz | sudo tar xzf - -C /usr/local/bin crane
       fi
 
       # NB: username doesn't seem to matter.