run type checks also for companion and add files to docker

[mifi]

theory: this PR's build should fail with

#23 22.96 node_modules/@szmarczak/http-timer/dist/source/index.d.ts(25,18): error TS2430: Interface 'ClientRequestWithTimings' incorrectly extends interface 'ClientRequest'.
#23 22.96   The types returned by 'setTimeout(...)' are incompatible between these types.
#23 22.96     Type 'ClientRequest' is not assignable to type 'this'.
#23 22.96       'ClientRequest' is assignable to the constraint of type 'this', but 'this' could be instantiated with a different subtype of constraint 'ClientRequest'.
#23 ERROR: process "/bin/sh -c cd /app && corepack yarn workspace @uppy/companion build" did not complete successfully: exit code: 1

#22 [linux/arm64 build 7/9] RUN apk --update add  --virtual native-dep   make gcc g++ python3 libgcc libstdc++ git &&   (cd /app && corepack yarn workspaces focus @uppy/companion) &&   apk del native-dep
#22 CANCELED
------
 > [linux/amd64 build 8/9] RUN cd /app && corepack yarn workspace @uppy/companion build:
22.96 node_modules/@szmarczak/http-timer/dist/source/index.d.ts(25,18): error TS2430: Interface 'ClientRequestWithTimings' incorrectly extends interface 'ClientRequest'.
22.96   The types returned by 'setTimeout(...)' are incompatible between these types.
22.96     Type 'ClientRequest' is not assignable to type 'this'.
22.96       'ClientRequest' is assignable to the constraint of type 'this', but 'this' could be instantiated with a different subtype of constraint 'ClientRequest'.

[mifi]

it did not fail 🤦‍♂️

[arturi]

From Slack (so we remember what happened in the future):

i think the problem with publishing the Docker image could be that we don't COPY everything into the image
stuff like tsconfig.json might be needed
it's probably safer to just copy everything