This pull requests sets up the e2e tests to be able to support multiple versions within the same test network. This is achieved through a few simple changes:
* Each node takes a `version` parameter in the testnet manifest. This dictates which version of the testapp to use. If not set, the locally available version is used.
* Adds a `testapp-docker.yml` workflow that publishes the testapp to docker hub so that tagged versions may be available for use in a multi-version test network.
This change does not actually add a testnetwork that does multi-version testing. Since no previous versions of the testapp have been published to dockerhub, there are not old versions available to test against. We'll either need to configure this after the next minor release which will trigger a testapp to be pushed to dockerhub, or push an image from the previous version of Tendermint so that the multiversion test has an old version to pull.
#### PR checklist
- [ ] Tests written/updated, or no tests needed
- [ ] `CHANGELOG_PENDING.md` updated, or no changelog entry needed
- [ ] Updated relevant documentation (`docs/`) and code comments, or no
documentation updates needed
Closes#5291. Adds a randomized testnet generator. Nightly CI job will be submitted separately. A few of the testnets can be a bit flaky, even after disabling known-faulty behavior and making minor tweaks, and the larger networks may be too resource-intensive to run in CI - this will be optimized separately.
This was a missing test case from the old P2P tests removed in #5453, which makes sure that all nodes are able to peer with each other regardless of how they discover peers.
Fixes#2795, since the default CI testnet uses a combination of (partially meshed) persistent peers and PEX-based seed nodes.
