Unify release and example-plugin CI workflows

.github/workflows/example-plugin.yml

@@ -1,22 +0,0 @@
-name: Build example plugin
-
-on: [push, pull_request, workflow_dispatch]
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v6
-        with:
-          submodules: true
-      - name: Set up Python
-        uses: actions/setup-python@v5
-        with:
-          python-version: "3.13"
-      - name: Build/install bindings
-        run: pip install .
-      - name: Build example plugin
-        run: |
-          cd example
-          pumpkin-plugin-build main

.github/workflows/main.yml

@@ -1,18 +1,15 @@
-name: Release
+name: Main
 on:
   push:
   workflow_dispatch:
-  workflow_run:
-    workflows: ["Update WIT"]
-    types: [completed]
 
 permissions:
   contents: write
   pull-requests: write
 
 jobs:
-  release:
+  main:
-    name: Build and release
+    name: Build, test, and release
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
@@ -31,6 +28,14 @@ jobs:
       - name: Build
         run: python -m build
 
+      - name: Install built artifacts
+        run: pip install dist/*.whl
+
+      - name: Build example plugin to test
+        run: |
+          cd example
+          pumpkin-plugin-build main
+
       - name: Set GITHUB_RELEASE_TAG & ARTIFACT_ID
         run: |
           set -eux