Add Etcd module

[prenaissance]

This PR adds etcd as a new module.

I've implemented a single-node initialization only. If anyone would benefit from a multi-node cluster testcontainer, please let me know through comments.

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[prenaissance]

Could we try a re-run on the failed jobs? I'll look for workarounds if this keeps failing on CI. Tested locally using act and npm run test:ci packages/modules/etcd:

[cristianrgreco]

The test is failing because it took longer than 5s to download the etcd image. Probably if you locally remove the image you'll reproduce the timeout and test failure.

Increase the test timeout, for example as done here:

testcontainers-node/packages/modules/kafka/src/kafka-container.test.ts

Line 7 in 87a5e5e

describe("KafkaContainer", { timeout: 240_000 }, () => {

[prenaissance]

Thanks for the hint! With the image removed it took 13 seconds locally to run the spec. I set the timeout to 30 seconds, hopefully that works for the CI run.

[cristianrgreco]

@prenaissance Thanks for the contribution!

[cristianrgreco]

@prenaissance I just realised the containers aren't exported from the index.ts https://github.com/testcontainers/testcontainers-node/blob/main/packages/modules/etcd/src/index.ts, e.g as done here: https://github.com/testcontainers/testcontainers-node/blob/main/packages/modules/cassandra/src/index.ts.

Please feel free to raise a PR to export them 🙂

[prenaissance]

My bad! Omw to fix this.