Flux 1.19.0

This minor version release is a bumper edition with many
contributions, including (to pick a handful):

• more flexibility with GPG signature verification
• the ability to disable garbage collection for individual resources
• users of .flux.yaml "patchUpdated" should see an improvement to automated updates, with fluxcd/flux#2805.
• people who want to tightly control which images are scanned by fluxd will appreciate fluxcd/flux#2850

Enhancements

• Add ssh-keygen key format option fluxcd/flux#2911
• Publish fluxctl to Docker Hub so it can be used in e.g., GitHub Actions fluxcd/flux#2915
• Add annotation for disabling garbage collection for individual resources fluxcd/flux#2858
• Dedicated error for unresolvable Git hostname fluxcd/flux#2865
• Support multiple signature verification strategies with --gitVerifySignaturesMode fluxcd/flux#2803
• Let people explicitly include images to scan fluxcd/flux#2850, fluxcd/flux#2852
• Add support for bash/zsh completion fluxcd/flux#2833
• Log start of cluster sync fluxcd/flux#2823
• Add JSON output option for fluxctl's list-images and list-workloads fluxcd/flux#2834

Fixes

• Cache the generators of patchUpdated configurations fluxcd/flux#2805
• address CVE-2020-6750 for glib fluxcd/flux#2922
• Fix concurrent map write panics fluxcd/flux#2926

Maintenance and documentation

• Add portforward package to break versioning deadlock fluxcd/flux#2952
• Make docker/image-tag work on MacOS again fluxcd/flux#2957
• Note the retirement of some maintainers fluxcd/flux#2953
• Migrate tests to GitHub actions fluxcd/flux#2940
• Update Kubernetes packages to 1.17 fluxcd/flux#2950
• Remove support for HelmRelease alpha and beta fluxcd/flux#2949
• Regenerate (and fix verification of) generated_templates.gogen.go fluxcd/flux#2942
• Update gitsrv used in e2e tests to v1.0.0 fluxcd/flux#2937
• Remove race condition in sync e2e test fluxcd/flux#2885
• Move github.com/2opremio/distribution to
  github.com/fluxcd/distribution fluxcd/flux#2884
• Update pluralization of yaml to non-disputable version fluxcd/flux#2876
• Change list in issue template to start at 1 fluxcd/flux#2842
• Fix more links fluxcd/flux#2948
• Update Who is using Flux in production fluxcd/flux#2849, fluxcd/flux#2943, fluxcd/flux#2930, fluxcd/flux#2898
• move to mkdocs fluxcd/flux#2919
• Mention new fluxctl arch linux package fluxcd/flux#2912
• Updated helm operator CRD URL in the documentation fluxcd/flux#2887
• Add other semver example with range fluxcd/flux#2866
• Fixing Helm operator docs link fluxcd/flux#2863
• Add note about targeting a specific Helm version for the Helm operator fluxcd/flux#2830

Thanks

Thanks to @2opremio, @ArchiFleKs, @alaa, @alesgurd, @borancar, @dholbach, @edwardyoung, @hiddeco, @infa-bsurber, @jimangel, @jstevans, @kharf, @mattfarina, @morremeyer, @ogerbron, @pchico83, @phillebaba, @shibumi, @squaremo, @stefanprodan, @stevenpall, @sysdevguru, @trevrosen, @yasserisa and @yiannistri for their contributions to this release.