print chainctl version after installation (#50)

For debugging it is helpful to know which version of chainctl we are
using. After installation, print `chainctl version` so we can search for
this in the action logs if necessary.

Signed-off-by: Colin Douglas <colin@chainguard.dev>

Author: cmdpdx

action.yaml

@@ -19,7 +19,7 @@ inputs:
       Determines if we export HTTP_AUTH env variable with chainctl auth
       token.
     required: false
-    default: false
+    default: "false"
 
   identity:
     description: |
@@ -49,7 +49,7 @@ inputs:
       Set the logging verbosity for chainctl. A value of 0 disables
       logging output. Valid values are 1-5, increasing in verbosity.
     required: false
-    default: 0
+    default: "0"
 
   config-path:
     description: |
@@ -62,7 +62,7 @@ inputs:
     description: |
       Whether to retry on errors downloading the chainctl binary.
     required: false
-    default: true
+    default: "true"
 
   apk-host:
     description: |
@@ -81,7 +81,7 @@ inputs:
     description: |
       Whether to install the Chainguard Libraries pip keyring package.
     required: false
-    default: false
+    default: "false"
 
 runs:
   using: "composite"
@@ -124,6 +124,9 @@ runs:
         chmod +x ./${out}
         echo "$(pwd)" >> $GITHUB_PATH
 
+        # Print the version of chainctl installed
+        ./${out} version
+
     - name: Authenticate with Chainguard (assumed identity)
       shell: bash
       if: ${{ inputs.identity != '' }}