1.13.0-test

tmp: don't run a release

1.12.0-20210609

[1.12.1-20210609]: chore: release version 1.12.0-20210609

1.12.0-20210608

[1.12.1-20210608]: chore: release version 1.12.0-20210608

Test release via GitHub Actions

chore: release using GitHub Actions

This adds a GitHub Actions workflow to release Syndesis. To trigger a
release one needs to push a tag with name `major.minor.patch`, e.g.
`1.17.0`. Use of a local repository cache in a temporary directory was
removed, as we need to rely on the caching provided by GitHub Actions.
We also use strict checksums in release so that makes it even safer.

1.12.0-20210424

[1.12.0-20210424]: chore: release version 1.12.0-20210424

1.12.0-20210423

[1.12.0-20210423]: chore: release version 1.12.0-20210423

1.12.0-20210422

[1.12.0-20210422]: chore: release version 1.12.0-20210422

1.12.0-20210329

[1.12.0-20210329]: chore: release version 1.12.0-20210329

1.12.0-20210327

[1.12.1-20210327]: chore: release version 1.12.0-20210327

1.12.0-20210325

[1.12.1-20210325]: chore: release version 1.12.0-20210325