add ci build - actions (#87)

* add  ci build

* fix step names

Author: Leah Wasser

.github/workflows/build-image.yml

@@ -0,0 +1,33 @@
+# This build will only build the image on any branch (besides main) where there is a push
+name: Build Docker Image
+
+on:
+  push:
+    branches:
+      - '*'
+      - '!main'
+
+jobs:
+  build-image:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Login to DockerHub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_HUB_USERNAME }}
+          password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
+
+      - name: Build Image
+        id: docker_build
+        uses: docker/build-push-action@v2
+        with:
+          context: ./
+          file: ./Dockerfile
+          push: false
+          tags: earthlab/r-python-eds-lessons-env:latest
+
+      - name: Image digest
+        run: echo ${{ steps.docker_build.outputs.digest }}

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

@@ -0,0 +1,32 @@
+# This build will build and push the image to docker hub upon a commit to the
+# main  branch only
+name: Push to Docker Hub from Main Branch
+
+on:
+  push:
+    branches: main
+
+jobs:
+  build-push-image:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Login to DockerHub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_HUB_USERNAME }}
+          password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
+
+      - name: Build and push image
+        id: docker_build
+        uses: docker/build-push-action@v2
+        with:
+          context: ./
+          file: ./Dockerfile
+          push: true
+          tags: earthlab/r-python-eds-lessons-env:latest
+
+      - name: Image digest
+        run: echo ${{ steps.docker_build.outputs.digest }}

.gitignore

@@ -2,3 +2,4 @@
 .DS_Store
 .nbgrader.log
 3.6
+.ipynb_checkpoints/