Switch to npm ci

Signed-off-by: Nick Slowinski <nick@nick-slowinski.de>

.forgejo/workflows/build-deploy.yaml

@@ -12,7 +12,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Install dependencies
-        run: npm install
+        run: npm ci
 
       - name: Build site
         run: npm run build

.forgejo/workflows/build.yaml

@@ -16,7 +16,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Install dependencies
-        run: npm install
+        run: npm ci
 
       - name: Build site
         run: npm run build