mock-server fails docker build

[LexLuengas]

Problem

Latest docker image build failed (https://github.com/EXXETA/openapi-cop/actions/runs/3337710608) due to package.json in mock-server not being found.

#10 17.04 npm WARN old lockfile Error: ENOENT: no such file or directory, open '/openapi-cop-docker/mock-server/package.json'
#10 17.04 npm WARN old lockfile  Could not fetch metadata for openapi-cop-mock-server@file:../mock-server [Error: ENOENT: no such file or directory, open '/openapi-cop-docker/mock-server/package.json'] {
#10 17.04 npm WARN old lockfile   errno: -2,
#10 17.04 npm WARN old lockfile   code: 'ENOENT',
#10 17.04 npm WARN old lockfile   syscall: 'open',
#10 17.04 npm WARN old lockfile   path: '/openapi-cop-docker/mock-server/package.json'
#10 17.04 npm WARN old lockfile }

There is also a warning pointing to a wrong runtime node version:

#10 17.10 npm WARN EBADENGINE Unsupported engine {
#10 17.10 npm WARN EBADENGINE   package: '@exxeta/[email protected]',
#10 17.10 npm WARN EBADENGINE   required: { node: '^10 || ^12' },
#10 17.10 npm WARN EBADENGINE   current: { node: 'v18.12.0', npm: '8.19.2' }
#10 17.10 npm WARN EBADENGINE }

Finally, there is also a minor warning about deprecated usage: #10 0.638 npm WARN config only Use --omit=dev to omit dev dependencies from the install..