chore: remove dev dependencies in docker build

[Tommytrg]

Remove dev dependencies after the build has finished

[guidiaz]

it doesn't seem to reduce docker image size, but still very nice to have anyway

[guidiaz]

Actually, not that good, as it provokes the following error when launching /dist/src/bin/ethers module on portainer:

internal/modules/cjs/loader.js:905
�
  throw err;
  ^
Error: Cannot find module 'ethers'
Require stack:
- /data/dist/src/bin/ethers/index.js
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:902:15)
    at Function.Module._load (internal/modules/cjs/loader.js:746:27)
    at Module.require (internal/modules/cjs/loader.js:974:19)
    at require (internal/modules/cjs/helpers.js:93:18)
    at Object.<anonymous> (/data/dist/src/bin/ethers/index.js:4:16)
    at Module._compile (internal/modules/cjs/loader.js:1085:14)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1114:10)
    at Module.load (internal/modules/cjs/loader.js:950:32)
    at Function.Module._load (internal/modules/cjs/loader.js:790:12)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:76:12) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [ '/data/dist/src/bin/ethers/index.js' ]
}