save benchmarking results as job summary (#158)

Author: hakkelt

.github/workflows/benchmark.yml

@@ -1,8 +1,7 @@
 name: Benchmark
 on:
   - pull_request
-permissions:
-  pull-requests: write    # needed to post comments
+
 jobs:
   benchmark:
     name: Benchmark
@@ -11,3 +10,4 @@ jobs:
       - uses: MilesCranmer/AirspeedVelocity.jl@action-v1
         with:
           julia-version: '1'
+          job-summary: 'true'