add check for forge images

.github/workflows/workflow-run-forge.yaml

@@ -180,6 +180,33 @@ jobs:
         shell: bash
         run: gcloud config set project aptos-forge-gcp-0
 
+      - name: Check for Forge images
+        if: ${{ !inputs.SKIP_JOB }}
+        id: check-forge-images
+        run: |
+          check_image_exists() {
+            local tag=$1
+            local image_name=$2
+            local output_prefix=$3
+            if [[ -n "$tag" ]]; then
+              if docker manifest inspect us-docker.pkg.dev/aptos-registry/docker/${image_name}:${tag} &> /dev/null; then
+                echo "${output_prefix}_EXISTS=true" >> $GITHUB_OUTPUT
+                echo "${output_prefix}_TAG=$tag" >> $GITHUB_OUTPUT
+                echo "✅ $image_name image found for tag: $tag" >> $GITHUB_STEP_SUMMARY
+              else
+                echo "${output_prefix}_EXISTS=false" >> $GITHUB_OUTPUT
+                echo "⚠️ No $image_name image found for tag: $tag. The latest available image will be used instead." >> $GITHUB_STEP_SUMMARY
+              fi
+            fi
+          }
+
+          check_image_exists "${{ inputs.GIT_SHA }}" "validator" "VALIDATOR_GIT_SHA"
+          check_image_exists "${{ inputs.IMAGE_TAG }}" "validator" "VALIDATOR_IMAGE_TAG"
+          check_image_exists "${{ inputs.GIT_SHA }}" "forge" "FORGE_GIT_SHA"
+          check_image_exists "${{ inputs.FORGE_IMAGE_TAG }}" "forge" "FORGE_IMAGE_TAG"
+
+          echo "ℹ️ If testing Forge changes, ensure the 'CICD: build-images' label is added to your PR and the image build workflow has completed successfully." >> $GITHUB_STEP_SUMMARY
+
       - name: Run pre-Forge checks
         if: ${{ !inputs.SKIP_JOB }}
         shell: bash
@@ -228,3 +255,4 @@ jobs:
       # Print out whether the job was skipped.
       - run: echo "Skipping forge test!"
         if: ${{ inputs.SKIP_JOB }}
+