Update workflow files

Author: lonefelidae16

.github/workflows/build.yml

@@ -29,12 +29,15 @@ jobs:
 
       - name: Get Commit hash
         run: |
-          if [ "${{ github.event_name }}" = "pull_request" ]; then
-            COMMIT_SHA=${{ github.event.pull_request.head.sha }}
+          if [ "${EVENT_NAME}" = "pull_request" ]; then
+            COMMIT_SHA=${PULL_SHA}
           else
             COMMIT_SHA=${GITHUB_SHA}
           fi
           echo "SHORT_SHA=$(echo $COMMIT_SHA | cut -c1-8)" >> $GITHUB_ENV
+        env:
+          EVENT_NAME: ${{ github.event_name }}
+          PULL_SHA: ${{ github.event.pull_request.head.sha }}
 
       - name: Export Version
         if: github.ref_type == 'tag'