fix extracted sha

Author: LeonHibnik

.github/workflows/cpp-golang-rust.yml

@@ -72,7 +72,7 @@ jobs:
       backend-type: metal
 
   test-curve:
-    name: Test Curve on ${{ matrix.backend }} with ${{ matrix.runner_os }}
+    name: Test Curve on ${{ matrix.backend }} with ${{ matrix.os }}
     runs-on: ${{ matrix.runner }}
     needs: [check-changed-files, check-format, extract-cuda-backend-branch, extract-metal-backend-branch]
     strategy:
@@ -82,10 +82,12 @@ jobs:
           - backend: cuda
             backend_upper: CUDA
             secret_key: CUDA_PULL_KEY
+            os: Linux
             runner: 'self-hosted, Linux, X64, icicle'
           - backend: metal
             backend_upper: METAL
             secret_key: METAL_PULL_KEY
+            os: macOS
             runner: 'self-hosted, macOS, arm64, icicle, metal'
         curve:
           - name: bn254
@@ -127,12 +129,12 @@ jobs:
       run: |
           BACKEND_SHA=$(git rev-parse HEAD)
           echo "Backend Commit SHA: $BACKEND_SHA"
-          echo "${{ matrix.backend }}-backend-sha=$BACKEND_SHA" >> $GITHUB_ENV
+          echo "extracted-backend-sha=$BACKEND_SHA" >> $GITHUB_OUTPUT
     - name: Set ${{ matrix.backend_upper }} backend flag
       if: needs.check-changed-files.outputs.golang == 'true' || needs.check-changed-files.outputs.cpp == 'true' ||  needs.check-changed-files.outputs.rust == 'true'
       id: backend-flag
       run: |
-        BACKEND_SHA=${{ env.${{ matrix.backend }}-backend-sha }}
+        BACKEND_SHA=${{ steps.extract-backend-sha.outputs.extracted-backend-sha }}
         CURVE=${{ matrix.curve.name }}
         COMMIT_FILE="gh_commit_sha_${CURVE}_${BACKEND_SHA}"
         if [ "${{ needs.extract-${{ matrix.backend }}-backend-branch.outputs.${{ matrix.backend }}-backend-branch }}" == "main" ]; then