add cd.yaml

[autotaker]

#19
This PR adds a workflow (Continuous delivery) to publish crates to crates.io.

Spec

Trigger

Continuous delivery workflow is triggered by pushing tags to the remote repository.
Tag must be of the form vX.Y.Z or vX.Y.Z-SUFFIX.
A tag with suffix means pre-release version and it enables --dry-run mode.

Secrets

Please set CARGO_REGISTRY_TOKEN for the authentication token for crates.io.

Jobs

• test
  • This job runs several tests defined in ci.yaml.
• publish
  • This job publishes crates (apalis-core, apalis-cron, apalis-redis, apalis-sql, and apalis) in an appropriate order.
  • If there are some inconsistencies between the tag version and a package version (written in Cargo.toml), the job fails before pushing the crates.

Test

I have created v0.3.4-rc10 tag and confirmed that the workflow succeeds.
https://github.com/autotaker/apalis/actions/runs/3355470587

Other changes

• Trigger of ci.yaml is changed
  • CI for topic branch runs only after creating a pull request. (push trigger is limited to master/develop)
  • Add workflow_call trigger to call CI workflow from CD workflow.

[geofmureithi]

Looks good to me.
I will merge and do a release over the weekend.