adding build for fitbit grabber

.github/workflows/fitbit-collect.yml

@@ -0,0 +1,40 @@
+on:
+  push:
+    branches: [ master ]
+    paths:
+      - 'fitbit-collect/*'
+      - '.github/workflows/fitbit-collect.yml'
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+        
+      -
+        name: Log into registry
+        uses: docker/login-action@28218f9b04b4f3f62068d7b6ce6ca5b26e35336c
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      -
+        name: Build and push 
+        uses: docker/build-push-action@v2
+        with:
+          context: fitbit-collect/
+          platforms: linux/arm/v7
+          push: true
+          file: fitbit-collect/Dockerfile
+          tags: ghcr.io/sstent/fitbit-collect:latest 
+