Created ARM and Raspberry Pi Support for Docker builds (markdown)

ARM-and-Raspberry-Pi-Support-for-Docker-builds.md

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+Per [this post](https://github.com/rr-/szurubooru/issues/192#issuecomment-476897156) by [WychWitch](https://github.com/WychWitch)
+
+> Here are my files! If this isn't enough let me know, I might've forgotten one. Again, this is only for rpi3/arm32v7
+>
+> replace all of the [name] and [password] with your own!
+
+**Client/Dockerfile**
+```Docker
+FROM arm32v7/node:9 as builder
+WORKDIR /opt/app
+
+COPY package.json ./
+RUN npm install
+
+COPY . ./
+
+ARG BUILD_INFO="docker-latest"
+ARG CLIENT_BUILD_ARGS=""
+RUN BASE_URL="__BASEURL__" node build.js --gzip ${CLIENT_BUILD_ARGS}
+
+
+FROM tobi312/rpi-nginx:alpine
+WORKDIR /var/www
+
+RUN \
+    # Create init file
+    echo "#!/bin/sh" >> /init && \
+    echo 'sed -i "s|__BACKEND__|${BACKEND_HOST}|" /etc/nginx/nginx.conf' >> /init && \
+    echo 'sed -i "s|__BASEURL__|${BASE_URL:-/}|g" /var/www/index.htm /var/www/manifest.json' >> /init && \
+    echo 'exec nginx' >> /init && \
+    chmod a+x /init
+
+CMD ["/init"]
+VOLUME ["/data"]
+
+COPY nginx.conf.docker /etc/nginx/nginx.conf
+COPY --from=builder /opt/app/public/ .
+```
+**Server/Dockerfile**
+```
+FROM scratch as approot
+WORKDIR /opt/app
+
+COPY alembic.ini wait-for-es generate-thumb ./
+COPY szurubooru/ ./szurubooru/
+COPY config.yaml.dist ./
+
+
+FROM python:3.6-slim
+WORKDIR /opt/app
+
+ARG PUID=1000
+ARG PGID=1000
+ARG PORT=6666
+RUN \
+    # Set users
+    mkdir -p /opt/app /data && \
+    groupadd -g ${PGID} app && \
+    useradd -d /opt/app -M -c '' -g app -r -u ${PUID} app && \
+    chown -R app:app /opt/app /data && \
+    # Create init file
+    echo "#!/bin/sh" >> /init && \
+    echo "set -e" >> /init && \
+    echo "cd /opt/app" >> /init && \
+    echo "./wait-for-es" >> /init && \
+    echo "alembic upgrade head" >> /init && \
+    echo "exec waitress-serve --port ${PORT} szurubooru.facade:app" \
+        >> /init && \
+    chmod a+x /init && \
+    # Install ffmpeg
+    apt-get -yqq update && \
+    apt-get -yq install --no-install-recommends ffmpeg libpq-dev make gcc libffi-dev zlib1g-dev libjpeg-dev libtiff-dev libfreetype6-dev liblcms2-dev libwebp-dev tcl-dev && \
+    rm -rf /var/lib/apt/lists/* && \
+    # Install waitress
+    pip3 install --no-cache-dir waitress
+
+COPY --chown=app:app requirements.txt ./requirements.txt
+RUN pip3 install --no-cache-dir -r ./requirements.txt
+
+# done to minimize number of layers in final image
+COPY --chown=app:app --from=approot / /
+
+VOLUME ["/data/"]
+EXPOSE ${PORT}
+USER app
+CMD ["/init"]
+```
+**.env**
+```
+# Database credentials
+POSTGRES_USER=[name]
+POSTGRES_PASSWORD=[password]
+
+# This shows up on the homescreen, indicating build information
+BUILD_INFO=latest
+
+# Port to expose HTTP service
+PORT=[port]
+
+# Directory to store image data
+## remember to chmod this directory
+MOUNT_DATA=/var/local/[name]/data
+
+# Directory to store database files
+MOUNT_SQL=/var/local/[name]/sql
+```
+
+**requirements.txt**
+```
+alembic>=0.8.5
+pyyaml>=3.11
+psycopg2-binary>=2.6.1
+SQLAlchemy>=1.0.12
+coloredlogs==5.0
+elasticsearch>=5.0.0
+elasticsearch-dsl>=5.0.0
+numpy>=1.8.2
+pillow>=4.3.0
+pynacl==1.2.1
+pytz>=2018.3
+pyRFC3339>=1.0
+```
+
+**docker-compose.yml**;
+```
+## Example Docker Compose configuration
+##
+## Use this as a template to set up docker-compose, or as guide to set up other
+## orchestration services
+version: '2'
+
+services:
+  api:
+    build:
+      context: ./server
+    depends_on:
+      - sql
+      - elasticsearch
+    environment:
+      ## These should be the names of the dependent containers listed above,
+      ## or FQDNs/IP addresses if these services are running outside of Docker
+      POSTGRES_HOST: sql
+      ESEARCH_HOST: elasticsearch
+      ## Credentials for database:
+      POSTGRES_USER: [Name]
+      POSTGRES_PASSWORD: [pass]
+      ## Commented Values are Default:
+      #POSTGRES_DB: defaults to same as POSTGRES_USER
+      #POSTGRES_PORT: 5432
+      #ESEARCH_PORT: 9200
+      #ESEARCH_INDEX: szurubooru
+      #LOG_SQL: 0 (1 for verbose SQL logs)
+    volumes:
+      - "${MOUNT_DATA}:/data"
+      - "./server/config.yaml:/opt/app/config.yaml"
+  client:
+    build:
+      context: ./client
+      args:
+        BUILD_INFO:
+    depends_on:
+      - api
+    environment:
+      BACKEND_HOST: api
+    volumes:
+      - "${MOUNT_DATA}:/data:ro"
+    ports:
+      - "${PORT}:80"
+  sql:
+    image: postgres:alpine
+    restart: unless-stopped
+    environment:
+      POSTGRES_USER: [name]
+      POSTGRES_PASSWORD: [pass]
+    volumes:
+      - "${MOUNT_SQL}:/var/lib/postgresql/data"
+  elasticsearch:
+    image: ind3x/rpi-elasticsearch
+    environment:
+      ## Specifies the Java heap size used
+      ## Read
+      ##  https://www.elastic.co/guide/en/elasticsearch/reference/current/docker.html
+      ## for more info
+      ES_JAVA_OPTS: -Xms512m -Xmx512m
+    volumes:
+      - index:/usr/share/elasticsearch/data
+
+volumes:
+  index: # Scratch space for ElasticSearch index, will be rebuilt if lost
+```