feat(install): Add fully automated install script

This adds a fully automated `install.sh` that does the following:

- Checks minimum Docker and `docker-compose` versions
- Checks minimum RAM available to Docker containers
- Removes potential user errors in install steps

install.sh

@@ -0,0 +1,93 @@
+#!/usr/bin/env bash
+set -e
+
+MIN_DOCKER_VERSION='1.10.0'
+MIN_COMPOSE_VERSION='1.17.0'
+MIN_RAM=3072 # MB
+ENV_FILE='.env'
+
+DID_CLEAN_UP=0
+# the cleanup function will be the exit point
+cleanup () {
+  if [ "$DID_CLEAN_UP" -eq 1 ]; then
+    return 0;
+  fi
+  echo "Cleaning up..."
+  docker-compose down &> /dev/null
+  DID_CLEAN_UP=1
+}
+trap cleanup ERR INT TERM
+
+echo "Checking minimum requirements..."
+
+DOCKER_VERSION=$(docker version --format '{{.Server.Version}}')
+COMPOSE_VERSION=$(docker-compose --version | sed 's/docker-compose version \(.\{1,\}\),.*/\1/')
+RAM_AVAILABLE_IN_DOCKER=$(docker run --rm busybox free -m 2>/dev/null | awk '/Mem/ {print $2}');
+
+# Function below is inspired by https://stackoverflow.com/a/29394504/90297
+function ver { printf "%03d%03d%03d%03d" $(echo "$1" | sed 's/^0*\([0-9]\+\)\.0*\([0-9]\+\)\.0*\([0-9]\+\).*/\1 \2 \3/' | head -n 3 ); }
+
+if [ $(ver $DOCKER_VERSION) -lt $(ver $MIN_DOCKER_VERSION) ]; then
+    echo "FAIL: Expected minimum Docker version to be $MIN_DOCKER_VERSION but found $DOCKER_VERSION"
+    exit -1
+fi
+
+if [ $(ver $COMPOSE_VERSION) -lt $(ver $MIN_COMPOSE_VERSION) ]; then
+    echo "FAIL: Expected minimum docker-compose version to be $MIN_COMPOSE_VERSION but found $COMPOSE_VERSION"
+    exit -1
+fi
+
+if [ "$RAM_AVAILABLE_IN_DOCKER" -lt "$MIN_RAM" ]; then
+    echo "FAIL: Expected minimum RAM available to Docker to be $MIN_RAM MB but found $RAM_AVAILABLE_IN_DOCKER MB"
+    exit -1
+fi
+
+echo ""
+echo "Creating volumes for persistent storage..."
+echo "Created $(docker volume create --name=sentry-data)."
+echo "Created $(docker volume create --name=sentry-postgres)."
+echo ""
+
+if [ -f "$ENV_FILE" ]; then
+  echo "$ENV_FILE already exists, skipped creation."
+else
+  echo "Creating $ENV_FILE..."
+  cp -n .env.example "$ENV_FILE"
+fi
+
+echo ""
+echo "Building and tagging Docker images..."
+echo ""
+docker-compose build
+echo ""
+echo "Docker images built."
+
+echo ""
+echo "Generating secret key..."
+# This is to escape the secret key to be used in sed below
+SECRET_KEY=$(docker-compose run --rm web config generate-secret-key 2> /dev/null | tail -n1 | sed -e 's/[\/&]/\\&/g')
+sed -i -e 's/^SENTRY_SECRET_KEY=.*$/SENTRY_SECRET_KEY='"$SECRET_KEY"'/' $ENV_FILE
+echo "Secret key written to $ENV_FILE"
+
+echo ""
+echo "Setting up database..."
+if [ $CI ]; then
+  docker-compose run --rm web upgrade --noinput
+  echo ""
+  echo "Did not prompt for user creation due to non-interactive shell."
+  echo "Run the following command to create one yourself (recommended):"
+  echo ""
+  echo "  docker-compose run --rm web createuser"
+  echo ""
+else
+  docker-compose run --rm web upgrade
+fi
+
+cleanup
+
+echo ""
+echo "----------------"
+echo "You're all done! Run the following command get Sentry running:"
+echo ""
+echo "  docker-compose up -d"
+echo ""