Make workflow workflow_call

.github/workflows/check-measurements-reproducibility.yml

@@ -1,24 +1,26 @@
 name: Check measurements reproducibility
 on:
-  release:
-    types: [created]
   workflow_dispatch:
     inputs:
       releasetag:
         type: string
         description: The release to checkout and download.
         required: true
+  workflow_call:
+    inputs:
+      releasetag:
+        type: string
+        description: The release to checkout and download.
+        required: true
 
 jobs:
   check-reproducibility:
     runs-on: ubuntu-22.04
-    env:
-      RELEASETAG: ${{ github.event_name == 'workflow_dispatch' && github.event.inputs.releasetag || github.event.release.tag_name }}
     steps:
       - name: Checkout
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
-          ref: ${{ env.RELEASETAG }}
+          ref: ${{ github.event.inputs.releasetag }}
       - name: Set up bazel
         uses: ./.github/actions/setup_bazel_nix
         with:
@@ -40,7 +42,7 @@ jobs:
           cd $(mktemp -d)
 
           echo "Downloading release measurements"
-          curl -O https://cdn.confidential.cloud/constellation/v2/ref/-/stream/stable/${{ env.RELEASETAG }}/image/measurements.json
+          curl -O https://cdn.confidential.cloud/constellation/v2/ref/-/stream/stable/${{ github.event.inputs.releasetag }}/image/measurements.json
 
           # compare all measurements with our own
           for directory in $buildPath/system/!(mkosi_wrapper.sh); do