Release 2021.2

This release mainly adds new APIs for file writing, which we will
use in the new ostree-rs-ext project to improve imports from tarballs.
The other feature is that rofiles-fuse now handles xattrs (but - rofiles-fuse
should be considered deprecated, see https://github.com/ostreedev/ostree/issues/2281 ).
There's also some more introspection API tweaks, and some testing improvements.

Thanks to all contributors!

Benjamin Gilbert (1):
      docs: fix "Edit this page on GitHub" links

Colin Walters (25):
      configure: post-release version bump
      .lgtm.yml: Add package deps
      installdeps: Drop PyYAML
      tests/pull-test: Use mv -f in a few cases
      cci: Update for buildroot changes
      repo: Fix load_variant_if_exists to return a nullable value
      repo: Ensure load_variant_if_exists sets NULL value
      build-sys: Include all mkinitcpio bits
      manual-tests: Fix unused variables
      core: Fix lgtm.com warning about always true `if (bits > 0)`
      tests: Drop openat override
      tests/inst: Update ostree crate
      tests/inst: Update rpm-ostree client
      tests/inst: Update tokio, hyper and nix
      build-sys: Remove --enable-experimental-api
      core: Drop unused error handling from object stream helper
      tests: Silence a gcc warning
      repo: Add ostree_repo_write_regfile_inline
      travis: Bump Ubuntu versions
      repo: Add ostree_repo_write_symlink
      repo: Add ostree_repo_write_regfile
      tests: More tests for inline writing
      repo: Ensure we set the size for regfile inline
      Release 2021.2
      configure: post-release version bump

Dan Nicholson (6):
      Remove apidoc .gitignore from version control
      Ensure consistent apidoc .gitignore
      travis: Don't ask any debconf questions when installing packages
      travis: Drop i386 Ubuntu target
      travis: Correct ci_suite settings for buster
      travis: Add back a 32 bit i386 build

Felix Krull (1):
      lib: fix some version tags

Stefan Berger (1):
      rofiles-fuse: Enable support for setting and getting xattrs

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