ci: move to new set-env way (#496)

See https://docs.github.com/en/free-pro-team@latest/actions/reference/workflow-commands-for-github-actions#environment-files for more information.

Closes #386

.github/workflows/pr-checks.yml

@@ -38,16 +38,11 @@ jobs:
             ${{ runner.os }}-yarn-
 
       - name: Run benchmarks
-        # New line stripping from: https://github.community/t/set-output-truncates-multiline-strings/16852/5
         run: |
           yarn install
           yarn lbu gen
           yarn lbu bench
-          RESULT="$(cat ./benchmark_output.txt)"
-          RESULT="${RESULT//'%'/'%25'}"
-          RESULT="${RESULT//$'\n'/'%0A'}"
-          RESULT="${RESULT//$'\r'/'%0D'}"
-          echo "::set-env name=BENCH_RESULT::$RESULT"
+          echo -e "BENCH_RESULT<<EOF\n$(cat ./benchmark_output.txt)\nEOF" | tee -a $GITHUB_ENV
 
       - name: Comment bench result
         uses: mshick/add-pr-comment@v1

packages/cli/src/benchmarking/printer.js

@@ -46,7 +46,7 @@ export function printBenchResults() {
     // something
     writeFileSync(
       pathJoin(process.cwd(), "benchmark_output.txt"),
-      result.join("\n"),
+      result.join("\n").trim(),
       "utf8",
     );
   }