build(ci): merge workflows and use cache

We now have a multi-job workflow, which means it will run the jobs in
parallel. Between jobs, we cache the artifacts generated by Foundry so
they can be reused. The artifacts cached are the result of compilation
by Foundry, and hence, they can be reused across jobs. The `build` job
is responsible for generating them, while the `test` and `fmt` jobs can
reuse them, which is why they `need` the `build` job.

.github/workflows/forge-ci.yml

@@ -0,0 +1,136 @@
+name: Forge CI to build, test and format
+
+on: 
+  pull_request:
+  push:
+    branches:
+      - main
+      - release/**
+    tags:
+      - "*"
+
+env:
+  FOUNDRY_PROFILE: ci
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Foundry
+        uses: foundry-rs/foundry-toolchain@v1
+        with:
+          # replace nightly because latest nightly release has some breaking changes that result in test failures
+          # this is a previous recent nightly release that should work
+          version: nightly-f625d0fa7c51e65b4bf1e8f7931cd1c6e2e285e9
+
+      - name: Print forge version
+        run: forge --version
+
+      - name: Build
+        run: forge build
+
+      - name: Add comment for build failure
+        if: failure()
+        uses: actions/github-script@v6
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            github.rest.issues.createComment({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: 'The build has failed. Please check the logs.'
+            })
+
+      - name: Cache Foundry artifacts (excluding binaries)
+        uses: actions/cache/save@v3
+        with:
+          key: "${{ github.job }}-${{ github.sha }}"
+          path: |
+            - ./out
+            - ./cache
+            - ./broadcast
+
+  test:
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Install Foundry
+        uses: foundry-rs/foundry-toolchain@v1
+        with:
+          # replace nightly because latest nightly release has some breaking changes that result in test failures
+          # this is a previous recent nightly release that should work
+          version: nightly-f625d0fa7c51e65b4bf1e8f7931cd1c6e2e285e9
+
+      - name: Restore cached Foundry artifacts
+        uses: actions/cache/restore@v3
+        with:
+          key: "${{ github.job }}-${{ github.sha }}"
+          path: |
+            - ./out
+            - ./cache
+            - ./broadcast
+
+      - name: Print forge version
+        run: forge --version
+
+      - name: Run tests
+        run: forge test -vvv
+
+      - name: Add comment for test failure
+        if: failure()
+        uses: actions/github-script@v6
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            github.rest.issues.createComment({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: 'The tests have failed. Please check the logs.'
+            })
+
+  fmt:
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Install Foundry
+        uses: onbjerg/foundry-toolchain@v1
+        with:
+          # replace nightly because latest nightly release has some breaking changes that result in test failures
+          # this is a previous recent nightly release that should work
+          version: nightly-f625d0fa7c51e65b4bf1e8f7931cd1c6e2e285e9
+
+      - name: Restore cached Foundry artifacts
+        uses: actions/cache/restore@v3
+        with:
+          key: "${{ github.job }}-${{ github.sha }}"
+          path: |
+            - ./out
+            - ./cache
+            - ./broadcast
+
+      - name: Print forge version
+        run: forge --version
+
+      - name: Check formatting
+        run: forge fmt --check
+
+      - name: Add comment for format failure
+        if: failure()
+        uses: actions/github-script@v6
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            github.rest.issues.createComment({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: 'The code is not formatted correctly. Please run `forge fmt` and push the changes.'
+            })