Add docker setup for development

closes #7870

docker/develop/Dockerfile

@@ -0,0 +1,62 @@
+FROM ruby:2.4.4-slim-stretch
+
+RUN DEBIAN_FRONTEND=noninteractive \
+    apt-get update && \
+    apt-get install -y -qq \
+        build-essential \
+        cmake \
+        curl \
+        ghostscript \
+        git \
+        imagemagick \
+        libcurl4-openssl-dev \
+        libidn11-dev \
+        libmagickwand-dev \
+        libmariadbclient-dev \
+        libpq-dev \
+        libssl-dev \
+        libxml2-dev \
+        libxslt-dev \
+        nodejs \
+        gosu \
+    && \
+    rm -rf /var/lib/apt/lists/*
+
+
+ARG DIA_UID
+ARG DIA_GID
+
+ENV HOME="/home/diaspora" \
+    GEM_HOME="/diaspora/vendor/bundle"
+
+RUN addgroup --gid $DIA_GID diaspora && \
+    adduser \
+        --no-create-home \
+        --disabled-password \
+        --gecos "" \
+        --uid $DIA_UID \
+        --gid $DIA_GID \
+        diaspora \
+    && \
+    mkdir $HOME /diaspora && \
+    chown -R diaspora:diaspora $HOME /diaspora
+
+
+RUN curl -L \
+        https://cifiles.diasporafoundation.org/phantomjs-2.1.1-linux-x86_64.tar.bz2 \
+        | tar -xj -C /usr/local/bin \
+            --transform='s#.*/##' \
+            phantomjs-2.1.1-linux-x86_64/bin/phantomjs
+
+
+ENV BUNDLE_PATH="$GEM_HOME" \
+    BUNDLE_BIN="$GEM_HOME/bin" \
+    BUNDLE_APP_CONFIG="/diaspora/.bundle"
+ENV PATH $BUNDLE_BIN:$PATH
+
+
+COPY docker-entrypoint.sh /entrypoint.sh
+COPY docker-exec-entrypoint.sh /exec-entrypoint.sh
+ENTRYPOINT ["/entrypoint.sh"]
+
+CMD ["./script/server"]

docker/develop/docker-compose.yml

@@ -0,0 +1,41 @@
+version: "3.4"
+
+volumes:
+  postgresql_data:
+  mysql_data:
+  dia_data_tmp:
+  dia_data_bundle:
+
+services:
+  diaspora:
+    build:
+      context: .
+      dockerfile: Dockerfile
+      args:
+        DIA_UID: "${DIASPORA_ROOT_UID}"
+        DIA_GID: "${DIASPORA_ROOT_GID}"
+    image: diaspora:dev-latest
+    volumes:
+      - "${DIASPORA_ROOT}:/diaspora:rw"
+      - dia_data_tmp:/diaspora/tmp
+      - dia_data_bundle:/diaspora/vendor/bundle
+    ports:
+      - 8080:3000
+    depends_on:
+      - "${DIASPORA_DOCKER_DB}"
+
+  postgresql:
+    image: postgres:10.3
+    ports:
+      - 55432:5432
+    volumes:
+      - postgresql_data:/var/lib/postgresql
+
+  mysql:
+    image: mariadb:10.2
+    ports:
+      - 53306:3306
+    volumes:
+      - mysql_data:/var/lib/mysql
+    environment:
+      MYSQL_ROOT_PASSWORD: mysql

docker/develop/docker-entrypoint.sh

@@ -0,0 +1,47 @@
+#!/bin/bash
+
+# ----- Ensure correct ownership of /diaspora -----
+dia_home=/home/diaspora
+
+HOST_UID=$(stat -c %u /diaspora)
+HOST_GID=$(stat -c %g /diaspora)
+
+if ! getent group $HOST_GID >/dev/null; then
+  groupmod --gid $HOST_GID diaspora
+fi
+
+if ! getent passwd $HOST_UID >/dev/null; then
+  usermod --uid $HOST_UID --gid $HOST_GID diaspora
+fi
+
+chown -R $HOST_UID:$HOST_GID /home/diaspora
+mkdir -p /diaspora/tmp/pids
+chown $HOST_UID:$HOST_GID /diaspora/tmp /diaspora/tmp/pids /diaspora/vendor/bundle
+
+# ----- Wait for DB ----
+if [ -z $DIA_NODB ] || [ ! $DIA_NODB -eq 1 ]; then
+  if grep -qFx "  <<: *postgresql" /diaspora/config/database.yml; then
+    host=postgresql
+    port=5432
+  else
+    host=mysql
+    port=3306
+  fi
+
+  c=0
+
+  trap '{ exit 1; }' INT
+  while ! (< /dev/tcp/${host}/${port}) 2>/dev/null; do
+    printf "\rWaiting for $host:$port to become ready ... ${c}s"
+    sleep 1
+    ((c++))
+  done
+  trap - INT
+  if [ ! -z $c ]; then
+    printf "\rWaiting for $host:$port to become ready ... done (${c}s)\n"
+  fi
+fi
+
+cd /diaspora
+
+gosu $HOST_UID:$HOST_GID "$@"

docker/develop/docker-exec-entrypoint.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+HOST_UID=$(stat -c %u /diaspora)
+HOST_GID=$(stat -c %g /diaspora)
+
+cd /diaspora
+gosu $HOST_UID:$HOST_GID "$@"