Merge pull request fluxcd#519 from fluxcd/release-v0.19.2

Merge pull request fluxcd#517 from cwyl02/default-observed-generation

Merge pull request fluxcd#511 from fluxcd/release-v0.19.1

Merge pull request fluxcd#507 from fluxcd/chart-meta-short-sha

Merge pull request fluxcd#499 from fluxcd/release-v0.19.0

Merge pull request fluxcd#503 from fluxcd/helm-validate-metadata

Merge pull request fluxcd#488 from fluxcd/release-v0.18.0

Release v0.18.0

Merge pull request fluxcd#487 from fluxcd/sha256-backport

storage: change Artifact checksum to SHA256

Merge pull request fluxcd#483 from fluxcd/release-v0.17.2

Release v0.17.2

Add tests for libgit2 remote callbacks

- Adds tests for the libgit2 remote callbacks
- Adds tests for CheckoutStrategyForImplementation with context timeout
  and verify timeout is respected by both the git implementations.

Signed-off-by: Sunny <darkowlzz@protonmail.com>