add arm7 action

.github/workflows/develop-arm7.yml

@@ -0,0 +1,44 @@
+name: Docker Develop Release
+
+on:
+  push:
+    branches: [ develop ]
+  pull_request:
+    branches: [ develop ]
+
+jobs:
+
+  docker-develop:
+    runs-on: ubuntu-latest
+
+    steps:
+
+      - name: Check Out Repo
+        uses: actions/checkout@v2
+        with:
+          ref: develop
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_HUB_USERNAME }}
+          password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@master
+        with:
+          platforms: all
+
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Build and push
+        id: docker_build
+        uses: docker/build-push-action@v2
+        with:
+          context: ./
+          file: ./Dockerfile
+          platforms: linux/arm/v7
+          push: true
+          tags: ${{ secrets.DOCKER_HUB_USERNAME }}/plex-meta-manager:develop