v1.3.0: Service context, exec fixes, WaitDelay fix, and more

This is Pebble version v1.3.0. It includes several notable features and fixes since v1.2.0, as well as many CI and testing improvements, and a significant refactoring of the Pebble internals.

What's Changed

Notable user-facing features and fixes:

• fix: pebble exec and "exec" health checks inherit environment from daemon by @rebornplusplus in #234
• fix: allow non-root user to specify current user/group when running commands by @benhoyt in #239
• feat: add support for services to configure working directory by @benhoyt in #245
• feat: add "service context" support for exec and health checks by @benhoyt in #246
• fix: do not inherit HOME and USER env vars from pebble daemon environment by @shayancanonical in #262
• fix(servstate): use WaitDelay to avoid Command.Wait blocking on stdin/out/err by @benhoyt in #275
• feat(logstate): log forwarding implementation II by @barrettj12 in #256

Refactoring and CI improvements:

• refactor: Pebble internals into an exportable package by @anpep in #226
• ci: allow Pebble to be packaged as a snap by @cjdcordeiro in #179
• ci: promote snap to candidate on every release by @cjdcordeiro in #255
• cli: public commands API by @anpep in #232
• build: update Go version to 1.20 by @barrettj12 in #171
• ci: build Pebble snap with Go 1.20 by @cjdcordeiro in #271
• feat(daemon): allowing adding external http handlers by @paul-rodriguez in #265
• feat(overlord): allow adding external managers by @paul-rodriguez in #273
• feat(cli): enable extended client access by @anpep in #285
• feat(daemon): daemon access for API extensions by @flotter in #293

New Contributors

• @sparkiegeek made their first contribution in #227
• @cjdcordeiro made their first contribution in #179
• @paul-rodriguez made their first contribution in #265
• @shayancanonical made their first contribution in #262

Full Changelog: v1.2.0...v1.3.0