added Dockerfile to build from source, added extra handling of variables for configs

[jianhonggalaxy]

Change Description	Reason for change	File/Component
converted Dockerfile-binary to Dockerfile.source	To build from source instead of relying on pre built binaries	celestia-appfolder, celestia-app.yml
Separated environment, arg variables in celestia-app.yml into a .env file instead	Realised theres a lot of dupulicated variables used in the arg and environment variables. Feel that its better to combine all these in a centralized place(.env) for better maintainability, flexibility and reduced risk of errors in celestia-app.yml	celestia-app.yml, Dockerfile.source, .env
Added docker-entrypoint.sh to start whenever consensus is started	This is a default template to be used for most tendermint projects. I've tried it to make it as generic as possible to be used across multiple projects and env are referenced in the .env file	celestia-app/docker-entrypoint.sh
Added checks for data folder if it exist to determine if its a new node	If its not a new node, do not attempt to re init, re download genesis, saving time and the node-id, will also remains the same.	celestia-app/docker-entrypoint.sh(L9-L26)
Added custom inputs of seeds for p2p.seeds in config.toml if its indicated in .env file	For most projects, customs seeds are needed as the default seeds from the github repo might not be updated. Need a way to update when news hits in discord	celestia-app/docker-entrypoint.sh(L28-L50)
Added custom inputs of peers for p2p.persistent_peers in config.toml if its indicated in .env file	For most projects, customs peers are needed as the default peers from the github repo or seed might not be updated or neough. Need a way to update when news hits in discord	celestia-app/docker-entrypoint.sh(L52-L56)
Added modifications indexer for config.toml if its indicated in .env file	This is useful to keep the disk space low, since we are running validators only, not rpc. Would want to modify this indexer="null" rather than the default "kv". In the future if we want to run rpc nodes, we can default it to KV	celestia-app/docker-entrypoint.sh(L58-L61)
Optionally download snapshots, if indicated	This is useful if we would want to keep our existing data. only download when needed to restore from snapshot	celestia-app/docker-entrypoint.sh(L63-L67)
Added Custom app pruning to config.toml. This modifies the APP_PRUNING, APP_PRUNING_KEEP_RECENT, APP_PRUNING_INTERVAL	This is useful to keep the disk space low, since we are running validators only, not rpc. We can modify it to custom prunning	celestia-app/docker-entrypoint.sh(L86-L99)
Added minimum-gas-prices	In most projects its needed to set minimum-gas-prices	celestia-app/docker-entrypoint.sh(L101-L104)
Separated enable-bbr.sh to its own script	This only seems to apply to celestia docker. so i've seprerated it and it only needs to run once	enable-bbr.sh