chore: caches base test

Author: 0xItadaki

.github/workflows/coverage.yml

@@ -37,24 +37,37 @@ jobs:
       - name: Install dependencies
         run: yarn --frozen-lockfile --network-concurrency 1
 
+      - name: Restore base coverage cache
+        id: cache-base
+        uses: actions/cache@v4
+        with:
+          path: .coverage-base/lcov.info
+          key: coverage-base-${{ github.event.pull_request.base.sha }}
+
       - name: Checkout base branch
-        if: github.event_name == 'pull_request'
+        if: steps.cache-base.outputs.cache-hit != 'true'
         uses: actions/checkout@v4
         with:
           ref: ${{ github.event.pull_request.base.sha }}
           path: base
 
       - name: Install base dependencies
-        if: github.event_name == 'pull_request'
+        if: steps.cache-base.outputs.cache-hit != 'true'
         working-directory: base
         run: yarn --frozen-lockfile --network-concurrency 1
 
       - name: Run base coverage
-        if: github.event_name == 'pull_request'
+        if: steps.cache-base.outputs.cache-hit != 'true'
         shell: bash
         working-directory: base
         run: yarn coverage
 
+      - name: Save base coverage to cache path
+        if: steps.cache-base.outputs.cache-hit != 'true'
+        run: |
+          mkdir -p .coverage-base
+          cp base/lcov.info .coverage-base/lcov.info
+
       - name: Run coverage
         shell: bash
         run: yarn coverage
@@ -69,13 +82,11 @@ jobs:
           coverage-files: lcov.info
           github-token: ${{ github.token }}
           update-comment: true
-        if: github.event_name == 'pull_request'
 
       - name: Compare previous coverage (against base branch)
-        if: github.event_name == 'pull_request'
         run: |
-          if [ -f base/lcov.info ]; then
-            old=$(lcov --summary base/lcov.info 2>/dev/null | awk '/lines\.+:/ {print $2}' | tr -d '%')
+          if [ -f .coverage-base/lcov.info ]; then
+            old=$(lcov --summary .coverage-base/lcov.info 2>/dev/null | awk '/lines\.+:/ {print $2}' | tr -d '%')
           else
             old=0
           fi