Add GitHub dependabot configuration

Author: NeverMendel

.github/dependabot.yml

@@ -0,0 +1,14 @@
+version: 2
+updates:
+
+  # Maintain dependencies for GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+
+  # Maintain dependencies for Docker
+  - package-ecosystem: "docker"
+    directory: "/"
+    schedule:
+      interval: "monthly"

.github/workflows/build-docker-image.yml

@@ -11,7 +11,7 @@ jobs:
         uses: actions/checkout@v3
 
       - name: Build Docker Image
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v4
         with:
           context: .
           push: false

.github/workflows/publish-docker-image.yml

@@ -16,14 +16,14 @@ jobs:
         uses: actions/checkout@v3
 
       - name: Login to DockerHub
-        uses: docker/login-action@v1
+        uses: docker/login-action@v2
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       - name: Extract metadata (tags, labels) for Docker
         id: meta
-        uses: docker/metadata-action@v3
+        uses: docker/metadata-action@v4
         with:
           images: nevermendel/leetcode-export
           tags: |
@@ -33,7 +33,7 @@ jobs:
             type=semver,pattern={{major}}.{{minor}}
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v4
         with:
           context: .
           push: true

Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:latest
+FROM alpine:3.17.1
 
 RUN apk add --no-cache \
       nss \