Migrate cloudflare-ddns to Rust

Add Cargo.toml, Cargo.lock and a full src/ tree with modules and tests
Update Dockerfile to build a Rust release binary and simplify CI/publish
Remove legacy Python script, requirements.txt, and startup helper
Switch .gitignore to Rust artifacts; update Dependabot and workflows to
cargo
Add .env example, docker-compose env, and update README and VSCode
settings

Remove the old Python implementation and requirements; add a Rust
implementation with Cargo.toml/Cargo.lock and full src/ modules, tests,
and notifier/heartbeat support. Update Dockerfile, build/publish
scripts, dependabot and workflows, README, and provide env-based
docker-compose and .env examples.

.github/dependabot.yml

@@ -1,6 +1,6 @@
 version: 2
 updates:
-  - package-ecosystem: 'pip'
+  - package-ecosystem: 'cargo'
     directory: '/'
     schedule:
       interval: 'daily'

.github/workflows/image.yml

@@ -3,6 +3,8 @@ name: Build cloudflare-ddns Docker image (multi-arch)
 on:
   push:
     branches: master
+    tags:
+      - 'v*'
   pull_request:
 
 jobs:
@@ -10,45 +12,48 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
-      # https://github.com/docker/setup-qemu-action
+        uses: actions/checkout@v4
+
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@v1
-      # https://github.com/docker/setup-buildx-action
-      - name: Setting up Docker Buildx
-        uses: docker/setup-buildx-action@v1
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
       - name: Login to DockerHub
         if: github.event_name != 'pull_request'
-        uses: docker/login-action@v1 
+        uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
 
-      - name: Extract branch name
-        shell: bash
-        run: echo "##[set-output name=branch;]$(echo ${GITHUB_REF#refs/heads/})"
-        id: extract_branch
+      - name: Extract version from Cargo.toml
+        id: version
+        run: |
+          VERSION=$(grep '^version' Cargo.toml | head -1 | sed 's/.*"\(.*\)".*/\1/')
+          echo "version=$VERSION" >> "$GITHUB_OUTPUT"
+
       - name: Docker meta
         id: meta
-        uses: docker/metadata-action@v3
+        uses: docker/metadata-action@v5
         with:
           images: timothyjmiller/cloudflare-ddns
-          sep-tags: ','
-          flavor: |
-            latest=false
           tags: |
-            type=raw,enable=${{ steps.extract_branch.outputs.branch == 'master' }},value=latest
-            type=schedule
-            type=ref,event=pr
-            
-      - name: Build and publish
-        uses: docker/build-push-action@v2
+            type=raw,enable=${{ github.ref == 'refs/heads/master' }},value=latest
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=raw,enable=${{ github.ref == 'refs/heads/master' }},value=${{ steps.version.outputs.version }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
         with:
           context: .
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
-          platforms: linux/ppc64le,linux/s390x,linux/386,linux/arm/v6,linux/arm/v7,linux/arm64/v8,linux/amd64
+          platforms: linux/amd64,linux/arm64,linux/arm/v7
           labels: |
             org.opencontainers.image.source=${{ github.event.repository.html_url }}
             org.opencontainers.image.created=${{ steps.meta.outputs.created }}
             org.opencontainers.image.revision=${{ github.sha }}
+            org.opencontainers.image.version=${{ steps.version.outputs.version }}