Docker Integration (Local Use Only)

This integration is not production ready - use locally for now. 
Usage
Blockscout requires PostgreSQL server. This is provided by starting the script (new docker image will be created named postgres)
Start command make start - Sets everything up and starts BlockScout in a docker container. To connect it to your local environment, configure using the ENV variables described below.
Example connecting to local ganache instance running on port 2000 on Mac/Windows:
COIN=DAI \
ETHEREUM_JSONRPC_VARIANT=ganache \ 
ETHEREUM_JSONRPC_HTTP_URL=http://host.docker.internal:2000 \
ETHEREUM_JSONRPC_WS_URL=ws://host.docker.internal:2000 \
make start
Blockscout will be available on localhost:4000
mac/Windows: Docker provides a special URL -  host.docker.internal - that is available in the container and routed to your local machine. 
Linux: Docker is starting using --network=host and all services are available on localhost
Migrations
By default, Makefile completes migrations on PostgreSQL creation. 
You can also run migrations manually using the make migrate command.
Migrations will clean up your local database
Env variables
BlockScout supports 3 different JSON RPC Variants. Variant can be configured using ETHEREUM_JSONRPC_VARIANT environment variable.
Example:
ETHEREUM_JSONRPC_VARIANT=ganache make start
Do not use sudo with make start command since
Basically, whenever one uses sudo with the Makefile/Docker, it causes this error of not being able to communicate with the node.
​https://github.com/poanetwork/blockscout/issues/2795#issuecomment-546076853​
otherwise, application inside the container cannot read environment variables including archive node's RPC/WebSockets endpoints
​
Available options are:
parity - Parity JSON RPC (Default)
geth - Geth JSON RPC
ganache - Ganache JSON RPC
Variable
Description
Default value
ETHEREUM_JSONRPC_VARIANT
Variant of your JSON RPC service: parity, geth or ganache
parity
ETHEREUM_JSONRPC_HTTP_URL
HTTP JSON RPC URL Only for geth or ganache variant
See below - based on JSONRPC variant
ETHEREUM_JSONRPC_WS_URL
WS JSON RPC url
See below - based on JSONRPC variant
ETHEREUM_JSONRPC_TRACE_URL
Trace URL Only for parity variant
http://localhost:8545
COIN
Default Coin
POA
LOGO
Coin logo
Empty
NETWORK
Network
Empty
SUBNETWORK
Subnetwork
Empty
NETWORK_ICON
Network icon
Empty
NETWORK_PATH
Network path
/
Default Values for JSONRPC Variants
ETHEREUM_JSONRPC_HTTP_URL default values:
For parity - http://localhost:8545
For geth - https://mainnet.infura.io/8lTvJTKmHPCHazkneJsY
For ganache - http://localhost:7545
ETHEREUM_JSONRPC_WS_URL default values:
For parity - ws://localhost:8546
For geth - wss://mainnet.infura.io/8lTvJTKmHPCHazkneJsY/ws
For ganache - ws://localhost:7545

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Variable	Description	Default value
`ETHEREUM_JSONRPC_VARIANT`	Variant of your JSON RPC service: `parity`, `geth` or `ganache`	`parity`
`ETHEREUM_JSONRPC_HTTP_URL`	HTTP JSON RPC URL Only for `geth` or `ganache` variant	See below - based on JSONRPC variant
`ETHEREUM_JSONRPC_WS_URL`	WS JSON RPC url	See below - based on JSONRPC variant
`ETHEREUM_JSONRPC_TRACE_URL`	Trace URL Only for `parity` variant	`http://localhost:8545`
`COIN`	Default Coin	`POA`
`LOGO`	Coin logo	Empty
`NETWORK`	Network	Empty
`SUBNETWORK`	Subnetwork	Empty
`NETWORK_ICON`	Network icon	Empty
`NETWORK_PATH`	Network path	`/`