fix: Enabling automated releases.

[patrickhammond]

Uses https://github.com/googleapis/release-please for automated changelog updates, pubspec updates, GitHub releases, etc.

Overview:

• Push to main triggers the release action which will update the version in pubspec.yaml, refresh CHANGELOG.md, and create a new release PR for review.
• Approving the release PR will automatically create a new release tag and create a Github release.
• When the automatic tag creation happens, the publish action will kick off to send everything to pub.dev.

@cjbell Setup is needed on your side before merging this PR to make everything work.

Github repository:

• Settings -> Actions -> General: check "Allow GitHub Actions to create and approve pull requests".
• Settings -> Environments: Create a new environment named pub.dev
  • Select "Selected branches and tags" from "Deployment branches and tags", choose "Add deployment branch or tag rule", choose "Ref type: Tag", and enter v*.
• Settings -> Secrets and variables -> Actions: Add an environment secret named RELEASE_PERSONAL_ACCESS_TOKEN with a Personal Access Token (https://github.com/settings/tokens). The PAT used will be the username that shows up in the automated release PR.
  • The PAT is needed so the release PR action can trigger the publish action. https://docs.github.com/en/actions/using-workflows/triggering-a-workflow#triggering-a-workflow-from-a-workflow

pub.dev:

• (Already complete...sharing for transparency) Go to https://pub.dev/packages/knock_flutter/admin and enable automated publishing from GitHub Actions. Repository is: knocklabs/knock-flutter, tag pattern is: v{{version}}, check Require GitHub Actions environment and set the environment value to be pub.dev.

Because we're adding this to an existing history, we need to be explicit in the next line for release-please about what version we want to use (only need to do this once, it'll figure it out from here on out) and declare a git SHA in the bootstrap file (again, it'll use this once and never again).

Release-As: 0.1.2

[linear]

KNO-4829 Automated publishing to pub.dev

[github-actions]

Coverage Report

Coverage after merging patrick-kno-4829-automated-publishing-to-pubdev into main will be

47.28%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
lib/src
api_client.dart	74.58%	100%	100%	74.58%	143, 21, 33, 35, 37, 39–40, 42–43, 46, 48, 51–54
feed_client.dart	0%	100%	100%	0%	100, 102–104, 106, 112–114, 116–117, 123–125, 127–128, 134–135, 139, 141, 144–146, 149, 151, 158, 160–161, 163–164, 166–167, 169–170, 172–173, 175, 177–178, 183–184, 186–187, 190–191, 193, 195, 197–199, 206, 212–213, 217, 219–221, 223–224, 226–227, 230–231, 236–237, 242, 245, 249–251, 254–255, 261–262, 265, 270–271, 277–278, 280–282, 286–287, 290, 294, 297–298, 300–302, 306–307, 310, 314, 317–318, 320–322, 326–327, 330, 334, 337–338, 340–342, 346–347, 350, 354, 357–358, 360–362, 364–365, 370–371, 374, 378, 381–382, 384–386, 390–391, 394, 398, 401–402, 404–406, 41, 410, 413–414, 416–420, 423–424, 426–427, 431, 434–435, 437–441, 444–445, 447–448, 452, 455–456, 458–459, 46, 460–462, 465–466, 468–469, 47, 473, 476, 480–482, 487–488, 49, 491–493, 495–499, 50, 501–502, 504, 51, 510–512, 520–529, 533–539, 54, 540, 547–549, 57–58, 60–61, 86, 88, 90–92, 95–97
knock.dart	51.28%	100%	100%	51.28%	101, 104–105, 108, 112–113, 117–119, 122, 124, 62–64, 66, 93, 96–98
preferences_client.dart	5.26%	100%	100%	5.26%	14, 22, 24–26, 28, 30, 33–35, 37–38, 41–44, 47–48
user_client.dart	0%	100%	100%	0%	11, 13–15, 17–18, 21, 29–31, 34–35, 38–39, 42–43, 46–47, 50–52, 55–56, 59–61, 63–64, 67, 7, 71–73, 76–77
lib/src/model
api_response.dart	14.29%	100%	100%	14.29%	20–22, 25–27
channel.dart	100%	100%	100%	100%
feed.dart	100%	100%	100%	100%
feed_options.dart	100%	100%	100%	100%
preferences.dart	100%	100%	100%	100%
recipient.dart	100%	100%	100%	100%
user.dart	91.30%	100%	100%	91.30%	66–67
feed_extensions.dart	100%	100%	100%	100%
feed_response.dart	100%	100%	100%	100%
knock_object.dart	100%	100%	100%	100%
lib/src/util
retry.dart	100%	100%	100%	100%
date_time.dart	100%	100%	100%	100%
arguments.dart	0%	100%	100%	0%	7