ci: add release-please workflow and bump action versions

- Add release-please (googleapis/release-please-action@v5) on push to main;
  release-type `simple`, seeded at 0.1.4 via manifest, `bump-minor-pre-major`
  so pre-1.0 breaking changes stay in 0.x (no surprise 1.0.0)
- Add release-please-config.json + .release-please-manifest.json
- Bump actions/checkout v4 -> v7 (foundry-toolchain@v1 already latest major, 1.9.0)

Author: dadadave80

.github/workflows/release-please.yml

@@ -0,0 +1,23 @@
+name: release-please
+
+on:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: write
+  issues: write
+  pull-requests: write
+
+jobs:
+  release-please:
+    runs-on: ubuntu-latest
+    steps:
+      # Uses the default GITHUB_TOKEN. Note: releases/PRs it opens will NOT trigger
+      # other workflows (e.g. CI on the release PR). Swap in a PAT secret if you need that.
+      - uses: googleapis/release-please-action@v5
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          config-file: release-please-config.json
+          manifest-file: .release-please-manifest.json

.github/workflows/test.yml

@@ -16,7 +16,7 @@ jobs:
     name: Foundry project
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
         with:
           submodules: recursive
 

.release-please-manifest.json

@@ -0,0 +1,3 @@
+{
+  ".": "0.1.4"
+}

release-please-config.json

@@ -0,0 +1,9 @@
+{
+  "$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json",
+  "bump-minor-pre-major": true,
+  "packages": {
+    ".": {
+      "release-type": "simple"
+    }
+  }
+}