fix: method for not specifying target

.github/workflows/test_action.yml

@@ -152,4 +152,4 @@ jobs:
         run: exit 1
       - name: Exit
         shell: bash
-        run: exit 0
+        run: exit 0

action.yml

@@ -27,7 +27,7 @@ inputs:
   target:
     description: target to build in Containerfile
     required: false
-    default: main
+    default: none
   container_registry:
     description: registry to store resulting container
     required: false
@@ -142,6 +142,17 @@ runs:
           io.artifacthub.package.readme-url=https://raw.githubusercontent.com/${{ github.repository }}/main/README.md
           io.artifacthub.package.logo-url=https://avatars.githubusercontent.com/u/120078124?s=200&v=4
 
+    - name: Determine extra args
+      id: extra-args
+      shell: bash
+      run: |
+        if [[ ${{ inputs.target }} == "none" ]]
+        then
+          echo "args=" >> $GITHUB_OUTPUT
+        else
+          echo "args=--target=${{ inputs.target }}" >> $GITHUB_OUTPUT
+        fi
+
     # Build image using Buildah action
     - name: Build Image
       id: build_image
@@ -161,8 +172,8 @@ runs:
         labels: ${{ steps.meta.outputs.labels }}
         oci: false
         #TODO: Split Containerfiles
-        extra-args: |
-          --target=${{ inputs.target }}
+        extra-args: ${{ steps.extra-args.outputs.args }}
+
 
     - name: Get list of images to verify
       id: images_to_verify