ci: run benchmarks (job_go_bench)

.github/workflows/main.yml

@@ -94,6 +94,18 @@ jobs:
         if: github.event_name == 'push' # this is limited to selected branches at the beginning of this file
         run: go test -coverprofile=unit.covdata.txt -vet=off -timeout=15m -race ./... # note that -race can easily make the crypto stuff 10x slower
 
+  job_go_bench:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+      - name: Set up Go environment
+        uses: actions/setup-go@v4
+        with:
+          go-version: '1.20'
+      - name: Run Go bench
+        run: go test -run='^$' -bench=. ./...
+
   job_compose_test:
     runs-on: [self-hosted, ci2-1]
     steps: