Merge pull request #1749 from fluxcd/release-1.40.0

Release v1.40.0

Merge pull request #1730 from fluxcd/xx-build

Optimize multi-arch build with XX

Merge pull request #1624 from fluxcd/fix-release-workflow

Setup Go toolchain for release workflow

Merge pull request #1596 from fluxcd/release-1.36.0

Release 1.36.0