fix: brackets and allow sha repeats (#56)

action.yml

@@ -138,7 +138,7 @@ runs:
       id: digest_old
       shell: bash
       run: |
-        DIGEST=$(docker manifest inspect ${{ steps.vars.outputs.tags }} || echo | jq '.manifests[0].digest')
+        DIGEST=$((docker manifest inspect ${{ steps.vars.outputs.tags }} || echo )| jq -r '.manifests[0].digest')
         echo "digest=${DIGEST}" >> $GITHUB_OUTPUT
 
     # If a build is required, then checkout, login, build and push!
@@ -180,13 +180,12 @@ runs:
       id: digest_new
       shell: bash
       run: |
-        DIGEST=$(docker manifest inspect ${{ steps.vars.outputs.tags }} | jq '.manifests[0].digest')
+        DIGEST=$(docker manifest inspect ${{ steps.vars.outputs.tags }} | jq -r '.manifests[0].digest')
         echo "digest=${DIGEST}" >> $GITHUB_OUTPUT
 
-    # Bug - fail if old and new digests match (e.g. no new image was built)
-    - name: SHA Double-check
-      if: steps.build.outputs.triggered == 'true' && steps.digest_new.outputs.digest == steps.digest_old.outputs.digest
-      shell: bash
+    - shell: bash
       run: |
-        echo "SHA collision! New: ${{ steps.digest_new.outputs.digest }}, Old: ${{ steps.digest_old.outputs.digest }}"
-        exit 1
+        # Summary
+        echo "digest_new: ${{ steps.digest_new.outputs.digest }}"
+        echo "digest_old: ${{ steps.digest_old.outputs.digest }}"
+        echo "triggered: ${{ steps.diff.outputs.triggered }}"