Add a pypy docker image. (#129)

.github/workflows/docker-build.yml

@@ -8,7 +8,7 @@ on:
       - dev-indep
 
 jobs:
-  build-docker:
+  cpython-build-docker:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
@@ -45,3 +45,40 @@ jobs:
           tags: ytorg/yotter:latest
           cache-from: type=local,src=cache
           cache-to: type=local,dest=cache
+  pypy-build-docker:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+        with:
+          platforms: all
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v1
+        with:
+          version: latest
+      - name: Login to DockerHub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+      - name: Get hash of latest image
+        run: docker pull pypy:3-slim-buster && docker inspect --format='{{index .RepoDigests 0}}' pypy:3-slim-buster > dockerhash.txt
+      - name: cache docker cache
+        uses: actions/cache@v2.1.2
+        with:
+          path: ${{ github.workspace }}/cache
+          key: ${{ runner.os }}-docker-${{ hashFiles('**/requirements.txt') }}-${{ hashFiles('**/dockerhash.txt') }}
+          restore-keys: |
+            ${{ runner.os }}-docker-
+      - name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: ./pypy.Dockerfile
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: ytorg/yotter:pypy
+          cache-from: type=local,src=cache
+          cache-to: type=local,dest=cache

pypy.Dockerfile

@@ -0,0 +1,40 @@
+FROM pypy:3-slim-buster AS base
+
+# Image to Build Dependencies
+FROM base AS builder
+
+WORKDIR /usr/src/app
+
+COPY ./requirements.txt /usr/src/app
+
+# Build Dependencies
+RUN apt-get update \
+    && apt-get install -yq build-essential libssl-dev libffi-dev libxml2-dev libxslt-dev zlib1g-dev \
+    && rm -rf /var/lib/apt/lists/* /etc/apt/sources.list.d/*
+
+# Python Dependencies
+RUN pip install --no-warn-script-location --ignore-installed --no-cache-dir --prefix=/install wheel cryptography gunicorn pymysql
+RUN pip install --no-warn-script-location --ignore-installed --no-cache-dir --prefix=/install -r requirements.txt
+
+# Runtime Environment Image
+FROM base
+
+WORKDIR /usr/src/app
+
+COPY --from=builder /install/bin /usr/local/bin
+COPY --from=builder /install/site-packages /opt/pypy/site-packages
+
+RUN apt-get update && apt-get install -y \
+    libxml2 libxslt1.1 \
+    && rm -rf /var/lib/apt/lists/* /etc/apt/sources.list.d/*
+
+COPY . .
+
+RUN flask db init
+
+CMD flask db stamp head \
+    && flask db migrate \
+    && flask db upgrade \
+    && gunicorn -b 0.0.0.0:5000 -k gevent -w 4 yotter:app
+
+EXPOSE 5000