ci: Fix bugs in #790 (#822)

* Fix bugs in #790

* Address feedback & cleanup

.github/workflows/bench-deploy.yml

@@ -36,6 +36,7 @@ jobs:
         run: cargo install cargo-criterion
       - name: Run benchmarks
         run: just --dotenv-filename bench.env gpu-bench fibonacci_lem
+        working-directory: ${{ github.workspace }}/benches
       # TODO: Prettify labels for easier viewing
       # Compress the benchmark file and metadata for later analysis
       - name: Compress artifacts

.github/workflows/merge-tests.yml

@@ -96,16 +96,22 @@ jobs:
           path: master
       # Copy the script so the base can bench with the same parameters
       - name: Copy source script to base branch
-        run: cd benches && cp justfile bench.env ../master/benches
+        run: cp justfile bench.env ../master/benches
+        working-directory: ${{ github.workspace }}/benches
       - name: Set base ref variable
-        run: cd master && echo "BASE_REF=$(git rev-parse HEAD)" >> $GITHUB_ENV
-      - run: echo ${{ env.BASE_REF }}
+        run: echo "BASE_REF=$(git rev-parse HEAD)" | tee -a $GITHUB_ENV
+        working-directory: ${{ github.workspace }}/master
       - name: Run GPU bench on base branch
-        run: cd master/benches && just --dotenv-filename bench.env gpu-bench fibonacci_lem
+        run: just --dotenv-filename bench.env gpu-bench fibonacci_lem
+        working-directory: ${{ github.workspace }}/master/benches
       - name: Copy bench output to PR branch
-        run: cp master/${{ env.BASE_REF }}.json .
+        run: |
+          mkdir -p target
+          cp -r master/target/criterion target
+          cp master/${{ env.BASE_REF }}.json .
       - name: Run GPU bench on PR branch
-        run: cd benches && just --dotenv-filename bench.env gpu-bench fibonacci_lem
+        run: just --dotenv-filename bench.env gpu-bench fibonacci_lem
+        working-directory: ${{ github.workspace }}/benches
       # Create a `criterion-table` and write in commit comment
       - name: Run `criterion-table`
         run: cat ${{ github.sha }}.json | criterion-table > BENCHMARKS.md
@@ -117,11 +123,10 @@ jobs:
       # Check for benchmark regression based on Criterion's configured noise threshold
       - name: Performance regression check
         id: check-regression
-        run: |
-          echo "regress_count=$(grep -c 'Regressed' ${{ github.sha }}.json)" >> $GITHUB_OUTPUT
+        run: echo "regress_count=$(grep -c 'Regressed' ${{ github.sha }}.json)" | tee -a $GITHUB_OUTPUT
       # Fail job if regression found
       - uses: actions/github-script@v6
-        if: ${{ steps.check-regression.outputs.regress_count }} > 0
+        if: ${{ steps.check-regression.outputs.regress_count > 0 }}
         with:
           script: |
             core.setFailed('Fibonacci bench regression detected')