Add regression check automation

This commit adds benchmark_regression_test.yml workflow that runs a
regression test by comparing the benchmark results of the current branch
with the previous benchmark results of the code in main branch.

Signed-off-by: Arjun Raja Yogidas <arjunry@amazon.com>

.github/workflows/benchmark_regression_test.yml

@@ -0,0 +1,68 @@
+name: Benchmark Regression Check
+
+on:
+  pull_request:
+    branches: [ main ]
+    paths:
+      - '**.go'
+      - 'go.*'
+      - 'cmd/go.*'
+      - 'Makefile'
+      - 'Dockerfile'
+      - 'integration/**'
+      - 'scripts/**'
+      - '.github/workflows/**'
+
+jobs:
+  benchmark-and-fetch-previous-results_and_compare:
+    name: Run Benchmark on current Branch
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-go@v4
+        with:
+          go-version: '1.18.10'
+      - run: make
+      - name: Run benchmark
+        run: make benchmarks-perf-test      
+      - name: Make previous directory
+        run: mkdir -v ${{ github.workspace }}/previous
+      - name: Download previous run artifact
+        id: download-artifact
+        uses: dawidd6/action-download-artifact@v2
+        with:
+          github_token: ${{secrets.GITHUB_TOKEN}}
+          name: benchmark-result-artifact
+          name_is_regexp: true
+          path: ${{ github.workspace }}/previous
+          repo: ${{ github.repository }}
+          check_artifacts: false
+          search_artifacts: true
+          skip_unpack: false
+          if_no_artifact_found: fail
+          workflow: benchmark_visualization.yml
+      - name: Perform Comparison and log results
+        id: run-compare
+        run: |
+            sudo chmod +x ${{ github.workspace }}/scripts/check_regression.sh
+            if sudo ${{ github.workspace }}/scripts/check_regression.sh ${{ github.workspace }}/previous/benchmark-result-artifact/results.json ${{github.workspace}}/benchmark/performanceTest/output/results.json; then
+              echo "Comparison successful. All P90 values are within the acceptable range."
+            else
+              echo "Comparison failed. Current P90 values exceed 110% of the corresponding past values."
+              echo "regression-detected=true" >> $GITHUB_OUTPUT
+            fi
+      - name: Stop the workflow if regression is detected
+        if: steps.run-compare.outputs.regression-detected == 'true'
+        uses: actions/github-script@v6
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            const comment = `
+              :warning: **Regression Detected** :warning:
+
+              The benchmark comparison indicates that there has been a performance regression.
+              Please investigate and address the issue.
+              To Investigate check logs of the previous job above.
+            `;
+
+            core.setFailed(comment);