Release of Apache Avro Rust SDK

Create a Git tag and archive the sources

# in avro-rs Git clone
git switch main && git pull --rebase
# update the version in Cargo.toml files to 0.21.0
git commit -am "Update version to 0.21.0"
git tag -s rel/release-0.21.0-rc0 -m "Avro-rs 0.21.0 RC0 release."
git archive HEAD -o apache-avro-rs-0.21.0-RC0.tgz
git push origin rel/release-0.21.0-rc0

Note: make sure your GPG key is in https://dist.apache.org/repos/dist/release/avro/KEYS

Upload the sources to SVN dev area

# checkout the 'dev' dist SVN repo
svn co https://dist.apache.org/repos/dist/dev/avro/ dev-avro
cd dev-avro/avro-rs
mkdir 0.21.0 && cd 0.21.0
cp .../apache-avro-rs-0.21.0-RC0.tgz .
sha256sum apache-avro-rs-0.21.0-RC0.tgz > apache-avro-rs-0.21.0-RC0.tgz.sha256
gpg --armor --output apache-avro-rs-0.21.0-RC0.tgz.asc --detach-sig apache-avro-rs-0.21.0-RC0.tgz
cd ..
svn add 0.21.0
svn ci -m "Add sources of avro-rs 0.21.0 for voting"

Send an email with similar content to dev@avro.apache.org:

[VOTE] Release Apache Avro Rust 0.21.0

Hi everyone,

I'd like to propose the following RC0 to be released as the official
Apache Avro Rust 0.21.0 release.

The commit id is https://github.com/apache/avro-rs/commit/9cb265d29351d3d0454bba30662f0066e04c171b
* This corresponds to the tag: rel/release-0.21.0-rc0
* https://github.com/apache/avro-rs/releases/tag/rel%2Frelease-0.21.0-rc0

The release tarball, signature, and checksums are here (revision r75797)
* https://dist.apache.org/repos/dist/dev/avro/avro-rs/0.21.0/

You can find the KEYS file here:
* https://dist.apache.org/repos/dist/release/avro/KEYS

This release includes 17 issues:
* https://github.com/apache/avro-rs/issues?q=is%3Aissue%20state%3Aclosed
* https://github.com/apache/avro-rs/releases/tag/untagged-48f08e126ce819116c4b

The easiest way to test the release is:
* mkdir 0.21.0 && cd 0.21.0
* wget -q https://dist.apache.org/repos/dist/dev/avro/avro-rs/0.21.0/apache-avro-rs-0.21.0-RC0.tgz
* tar xvf apache-avro-rs-0.21.0-RC0.tgz
* cargo fmt --check && cargo test
* (optional) Update your project Cargo.toml to use `apache_avro = { path = "/path/to/0.21.0/avro" } and test your application

Please download, verify, and test. This vote will remain open for at
least 72 hours.

[ ] +1 Release this as Apache Avro-rs 0.21.0
[ ] 0
[ ] -1 Do not release this because...

Regards,
Martin

After a successful vote

git checkout -b release-0.21.0-rc0 rel/release-0.21.0-rc0

cargo publish -p apache-avro-derive
cargo publish -p apache-avro-test-helper
cargo publish -p apache-avro

git tag -s rel/release-0.21.0 -m "Apache Avro Rust SDK 0.21.0 release."
git push --tags

Create a Github release

  1. Go to https://github.com/apache/avro-rs/releases/new
  2. Select rel/release-0.21.0 as the release tag and auto as the previous one (or select one manually)
  3. Click Generate release notes to populate the body
  4. Type a Release title, e.g. Apache Avro Rust SDK 0.21.0 release
  5. Make sure Set as the latest release checkbox is checked
  6. Press the Publish release button

Announce the release

  1. Send en email to dev@avro.apache.org and user@avro.apache.org with the following title and body: 1.1. Title: [ANNOUNCE] Apache Avro Rust SDK 0.21.0 release 1.2. Body:
Hello!

On behalf of the Apache Avro team I am happy to announce the release of Apache Avro Rust SDK version 0.21.0!

It is available at Crates.io:
- https://crates.io/crates/apache-avro
- https://crates.io/crates/apache-avro-derive


What's changed since vX.Y.Z:

* item 1
* item 2


New Contributors:

* contributor 1
* contributor 2

https://github.com/apache/avro-rs/releases/tag/rel%2Frelease-0.21.0```

The items could be taken from the body of the Github release ignoring the Dependabot updates:
1. Copy the body of the Github release and paste it in a temporary file, e.g. `/tmp/v0.21.0`
2. `cat /tmp/v0.21.0 | grep -v dependabot`
3. Paste the output in the email body