ci: fix revision for docs generation & add dependabot (#50)

* ci: fix revision for docs generation

* ci: add dependabot

.github/dependabot.yml

@@ -0,0 +1,8 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions" # See documentation for possible values
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "weekly"
+    commit-message:
+      prefix: "actions"

.github/workflows/update-docs.yml

@@ -20,20 +20,20 @@ jobs:
         package: ["nixos", "home-manager"]
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: cachix/install-nix-action@v22
 
+      - name: Get short revision
+        id: rev
+        run:
+          echo "rev=$(git rev-parse --short HEAD)" >> "$GITHUB_OUTPUT"
+
       - name: Build doc
         run: nix build .#${{ matrix.package }}-doc
 
       - name: Update doc
         run: cat result > docs/${{ matrix.package }}-options.md
 
-      - name: Get short revision
-        id: rev
-        run:
-          echo "rev=$(git rev parse --short HEAD)" >> "$GITHUB_OUTPUT"
-
       - name: Commit changes
         uses: EndBug/add-and-commit@v9
         with: