Add initial benchmarking infrastructure (#1232)

* Add initial benchmarking infrastructure

* Add CI file

* Try to comment on commits

* Implement file download benchmarks!

* drop commit comments (they dont work)

* Allow running local binary

* Better action

* More docs!

* Better look?

* even better look

* add pretty=all, none benchmarks

.github/workflows/benchmark.yml

@@ -0,0 +1,52 @@
+name: Benchmark
+
+on:
+  pull_request:
+    types: [ labeled ]
+
+permissions:
+  issues: write
+  pull-requests: write
+
+jobs:
+  test:
+    if: github.event.label.name == 'benchmark'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+        with:
+          python-version: "3.9"
+
+      - id: benchmarks
+        name: Run Benchmarks
+        run: |
+          python -m pip install pyperf>=2.3.0
+          python extras/profiling/run.py --fresh --complex  --min-speed=6 --file output.txt
+          body=$(cat output.txt)
+          body="${body//'%'/'%25'}"
+          body="${body//$'\n'/'%0A'}"
+          body="${body//$'\r'/'%0D'}"
+          echo "::set-output name=body::$body"
+
+      - name: Find Comment
+        uses: peter-evans/find-comment@v1
+        id: fc
+        with:
+          issue-number: ${{ github.event.pull_request.number }}
+          comment-author: 'github-actions[bot]'
+          body-includes: '# Benchmarks'
+
+      - name: Create or update comment
+        uses: peter-evans/create-or-update-comment@v1
+        with:
+          comment-id: ${{ steps.fc.outputs.comment-id }}
+          issue-number: ${{ github.event.pull_request.number }}
+          body: |
+            # Benchmarks
+            ${{ steps.benchmarks.outputs.body }}
+          edit-mode: replace
+
+      - uses: actions-ecosystem/action-remove-labels@v1
+        with:
+          labels: benchmark