Cache regression tests in workflow

.github/workflows/main.yml

@@ -16,20 +16,29 @@ jobs:
     name: Build regression tests
     runs-on: ubuntu-latest
     container: ghcr.io/kuznia-rdzeni/riscv-toolchain:2023.10.08_v
+    outputs:
+        container_id: ${{ job.container.id }}
     steps:
       - name: Checkout
         uses: actions/checkout@v3
         with:
           submodules: recursive
 
-      - name: Build riscv-tests
-        run: cd test/external/riscv-tests && make
-
-      - uses: actions/upload-artifact@v3
+      - name: Cache regression-tests
+        id: cache-regression
+        uses: actions/cache@v3
+        env:
+          cache-name: cache-regression-tests
         with:
-          name: "riscv-tests"
-          path: |
-            test/external/riscv-tests/test-*
+          path: test/external/riscv-tests/test-*
+          key: ${{ env.cache-name }}-${{ runner.os }}-${{
+            job.container.id }}-${{ hashFiles('**/test/external/riscv-tests') }}
+          restore-keys: |
+            ${{ env.cache-name }}-${{ runner.os }}-${{ job.container.id }}-
+
+      - if: ${{ steps.cache-regression.outputs.cache-hit != 'true' }}
+        name: Build riscv-tests
+        run: cd test/external/riscv-tests && make
 
   run-regression-tests:
     name: Run regression tests
@@ -40,6 +49,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v3
+        with:
+          submodules: recursive
 
       - name: Set up Python
         uses: actions/setup-python@v4
@@ -58,10 +69,16 @@ jobs:
           . venv/bin/activate
           PYTHONHASHSEED=0 ./scripts/gen_verilog.py --verbose --config full
 
-      - uses: actions/download-artifact@v3
+      - uses: actions/cache@v3
+        env:
+          cache-name: cache-regression-tests
         with:
-          name: "riscv-tests"
-          path: test/external/riscv-tests
+          submodules: recursive
+          path: test/external/riscv-tests/test-*
+          key: ${{ env.cache-name }}-${{ runner.os }}-${{
+            needs.build-regression-tests.outputs.container_id }}-${{ hashFiles('**/test/external/riscv-tests') }}
+          restore-keys: |
+            ${{ env.cache-name }}-${{ runner.os }}-${{ needs.build-regression-tests.outputs.container_id }}-
 
       - name: Run tests
         run: |