♻️ Refactor gas-diff CI job (#1508)

Author: atarpara

.github/workflows/ci-all-via-ir.yml

@@ -23,6 +23,8 @@ jobs:
       - name: Install Dependencies
         run: forge install
 
+      # NOTE: skipping solc 0.8.32 due to compiler bug
+      # https://github.com/argotorg/solidity/issues/16360
       - name: Run Tests with ${{ matrix.profile }}
         run: >
           ( [ "${{ matrix.profile }}" = "via-ir-0" ] &&
@@ -45,8 +47,6 @@ jobs:
             forge test --use 0.8.16 --via-ir &&
             forge test --use 0.8.17 --via-ir
           ) ||
-          # NOTE: skipping solc 0.8.32 due to compiler bug
-          # https://github.com/argotorg/solidity/issues/16360
           ( [ "${{ matrix.profile }}" = "via-ir-3" ] &&
             forge test --use 0.8.33 --via-ir &&
             forge test --use 0.8.31 --via-ir &&

.github/workflows/ci.yml

@@ -139,11 +139,19 @@ jobs:
       - name: Generate gas diff
         uses: atarpara/[email protected]
         id: gas_diff
-      - name: Add gas diff to sticky comment
-        uses: marocchino/sticky-pull-request-comment@v2
+      - name: Save gas diff output
+        if: steps.gas_diff.outputs.markdown
+        run: |
+          mkdir -p ./gas-diff
+          echo "${{ steps.gas_diff.outputs.markdown }}" > ./gas-diff/comment.md
+          echo "${{ github.event.number }}" > ./gas-diff/pr-number.txt
+      - name: Upload gas diff artifact
+        if: steps.gas_diff.outputs.markdown
+        uses: actions/upload-artifact@v4
         with:
-          delete: ${{ !steps.gas_diff.outputs.markdown }}
-          message: ${{ steps.gas_diff.outputs.markdown }}
+          name: gas-diff
+          path: gas-diff/
+
 
   prep-checker:
     runs-on: ${{ matrix.os }}

.github/workflows/gas-diff-comment.yml

@@ -0,0 +1,38 @@
+name: Post Gas Diff Comment
+
+on:
+  workflow_run:
+    workflows: ["ci"]
+    types:
+      - completed
+
+jobs:
+  comment:
+    if: github.event.workflow_run.event == 'pull_request' && github.event.workflow_run.conclusion == 'success'
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+    steps:
+      - name: Download gas diff artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: gas-diff
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          run-id: ${{ github.event.workflow_run.id }}
+      - name: Read PR number
+        id: pr
+        run: echo "number=$(cat pr-number.txt)" >> $GITHUB_OUTPUT
+      - name: Read gas diff
+        id: gas_diff
+        run: |
+          if [ -f comment.md ]; then
+            echo "markdown<<EOF" >> $GITHUB_OUTPUT
+            cat comment.md >> $GITHUB_OUTPUT
+            echo "EOF" >> $GITHUB_OUTPUT
+          fi
+      - name: Add gas diff to sticky comment
+        uses: marocchino/sticky-pull-request-comment@v2
+        with:
+          number: ${{ steps.pr.outputs.number }}
+          delete: ${{ !steps.gas_diff.outputs.markdown }}
+          message: ${{ steps.gas_diff.outputs.markdown }}