upgrade checkout action to v4 (#11)

* upgrade checkout action to v4

* add dependabot config for github actions

* add weeder-action

* add basic weeder config

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
   generate:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - id: generate
         uses: freckle/stack-action/generate-matrix@v4
     outputs:
@@ -29,15 +29,20 @@ jobs:
       fail-fast: false
 
     steps:
-      - uses: actions/checkout@v3
-      - uses: freckle/stack-action@v4
+      - uses: actions/checkout@v4
+      - id: stack
+        uses: freckle/stack-action@v4
         with:
           stack-yaml: ${{ matrix.stack-yaml }}
+      - if: ${{ matrix.stack-yaml == 'stack.yaml' }}
+        uses: freckle/weeder-action@v2
+        with:
+          ghc-version: ${{ steps.stack.outputs.compiler-version }}
 
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: haskell/actions/hlint-setup@v2
       - uses: haskell/actions/hlint-run@v2
         with:

.github/workflows/release.yml

@@ -9,7 +9,7 @@ jobs:
     if: false # Remove when ready to release
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - id: tag
         uses: freckle/haskell-tag-action@v1

weeder.toml

@@ -0,0 +1,2 @@
+roots = [ "Main.main" ]
+type-class-roots = true