fix: add ca-certificates in final image

[jim380]

Otherwise you'd get:

3:15AM DBG connecting to websocket module=oracle provider=okx
3:15AM DBG connecting to websocket module=oracle provider=coinbase
3:15AM DBG connecting to websocket module=oracle provider=huobi
3:15AM DBG connecting to websocket module=oracle provider=mexc
3:15AM DBG connecting to websocket module=oracle provider=bitget
3:15AM ERR error="error connecting to bitget websocket: x509: certificate signed by unknown authority" module=oracle provider=bitget
3:15AM DBG connecting to websocket module=oracle provider=bitget
3:15AM ERR error="error connecting to coinbase websocket: x509: certificate signed by unknown authority" module=oracle provider=coinbase
3:15AM DBG connecting to websocket module=oracle provider=coinbase
3:15AM ERR error="error connecting to okx websocket: x509: certificate signed by unknown authority" module=oracle provider=okx
3:15AM DBG connecting to websocket module=oracle provider=okx
3:15AM DBG Error getting available pairs for provider error="Get \"https://api-osmosis.imperator.co/pairs/v1/summary\": x509: certificate signed by unknown authority" module=oracle provider_name=osmosis
3:15AM ERR error="error connecting to mexc websocket: x509: certificate signed by unknown authority" module=oracle provider=mexc
3:15AM DBG connecting to websocket module=oracle provider=mexc
3:15AM ERR error="error connecting to bitget websocket: x509: certificate signed by unknown authority" module=oracle provider=bitget
3:15AM ERR error="error connecting to coinbase websocket: x509: certificate signed by unknown authority" module=oracle provider=coinbase
3:15AM ERR error="error connecting to okx websocket: x509: certificate signed by unknown authority" module=oracle provider=okx
3:15AM DBG Error getting available pairs for provider error="Get \"https://api.huobi.pro/market/tickers\": x509: certificate signed by unknown authority" module=oracle provider_name=huobi
3:15AM ERR error="error connecting to mexc websocket: x509: certificate signed by unknown authority" module=oracle provider=mexc
3:15AM ERR error="error connecting to huobi websocket: x509: certificate signed by unknown authority" module=oracle provider=huobi
3:15AM DBG connecting to websocket module=oracle provider=huobi
3:15AM INF batch relay enabled; starting to relay batches to Ethereum loop=RelayerMainLoop module=gravity_relayer
3:15AM FTL failed to connect to Alchemy websocket endpoint=wss://eth-mainnet.g.alchemy.com/v2/xxxxxxx err="x509: certificate signed by unknown authority" module=gravity_contract

[facundomedica]

LGTM, thank you so much!