ci: add CI job to check whether anvil state is up to date (#237)

Fixes #234 

### What Changed?
This PR introduces the following changes
* Adds a CI job to check if the anvil dump state is up to date.
* Fixes the anvil's initial timestamp, otherwise the dump state will be
different each time (since the timestamps are included in the state).
* Updates the anvil dump state.

The CI job works by generating a new anvil state and comparing it
against the existing one using the `diff` command.
If the new anvil state is different it means the existing one is
outdated and therefore the CI will fail.
**Note:** before performing the comparison between the existing and the
new state, both files are sorted since the JSON format does preserve
item order.

### Reviewer Checklist

- [ ] New features are tested and documented
- [ ] PR has one of the `changelog-X` labels (if applies)
- [ ] Code deprecates any old functionality before removing it

.github/workflows/integration.yml

@@ -95,3 +95,37 @@ jobs:
         with:
           name: coverage-summary
           path: coverage.zip
+
+  check_anvil_dump:
+    strategy:
+      fail-fast: true
+
+    name: Check anvil dump state is up to date
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: ./crates/contracts/anvil
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Install Foundry
+        uses: foundry-rs/foundry-toolchain@v1
+        with:
+          version: stable
+
+      - name: Backup existing anvil dump state
+        run: |
+          cd contracts_deployed_anvil_state.json
+          cp state.json previous_state.json
+      
+      - name: Generate new anvil dump state
+        run: ./deploy-contracts-save-anvil-state.sh
+
+      - name: Check whether the anvil dump state has changed
+        run: |
+          cd contracts_deployed_anvil_state.json
+          jq --sort-keys . previous_state.json > previous_state.json
+          jq --sort-keys . state.json > state.json
+          diff previous_state.json state.json

crates/contracts/anvil/utils.sh

@@ -34,6 +34,7 @@ start_anvil_docker() {
     docker run --rm -d --name anvil -p 8545:8545 $LOAD_STATE_VOLUME_DOCKER_ARG $DUMP_STATE_VOLUME_DOCKER_ARG \
         --entrypoint anvil \
         $FOUNDRY_IMAGE \
-        $LOAD_STATE_ANVIL_ARG $DUMP_STATE_ANVIL_ARG --host 0.0.0.0
+        $LOAD_STATE_ANVIL_ARG $DUMP_STATE_ANVIL_ARG --host 0.0.0.0 \
+        --timestamp 0
     sleep 2
 }