/.github/{scripts,workflows}: use the issue-number arg in comment benchmarking job

.github/workflows/ci-performance-benchmarks-report.yaml

@@ -8,7 +8,7 @@ jobs:
   report-pull-request:
     name: Report Performance Benchmarks on Pull Request
     runs-on: ubuntu-18.04
-    if: ${{ github.event.client_payload.issue_number != "" }}
+    if: ${{ github.event.client_payload.issue_number != "-1" }}
     steps:
       - name: Checkout
         uses: actions/checkout@v2
@@ -49,7 +49,7 @@ jobs:
   report-email:
     name: Report Performance Benchmarks via Email
     runs-on: ubuntu-18.04
-    if: ${{ github.event.client_payload.issue_number == "" }}
+    if: ${{ github.event.client_payload.issue_number == "-1" }}
     steps:
       - name: Checkout
         uses: actions/checkout@v2

.github/workflows/ci-performance-benchmarks.yaml

@@ -73,6 +73,12 @@ jobs:
           KUBECONFIG=kubeconfig kubectl config use-context github-actions-dolt-context
         env:
           CONFIG: ${{ secrets.CORP_KUBECONFIG }}
+      - name: Get pull number
+        uses: actions/github-script@v3
+        id: get_pull_number
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: core.setOutput("pull_number", JSON.stringify(context.issue.number));
       - name: Run benchmarks
         id: run-benchmarks
         run: ./.github/scripts/performance-benchmarking/run-benchmarks.sh
@@ -82,6 +88,7 @@ jobs:
           TO_SERVER: 'dolt'
           TO_VERSION: ${{ steps.comment-branch.outputs.head_sha }}
           MODE: 'pullRequest'
+          ISSUE_NUMBER: ${{ steps.get_pull_number.outputs.pull_number }}
           ACTOR: ${{ github.actor }}
           KUBECONFIG: "./kubeconfig"
           TEMPLATE_SCRIPT: "./.github/scripts/performance-benchmarking/get-dolt-dolt-job-json.sh"