* feat: add basic scaffolding for alpine, based on debian implementation

* feat: add baseline packages from <https://github.com/alpinelinux/aports/blob/master/main/git/APKBUILD>

* fix: add `curl` package (needed for version lookup)

* feat: use `jq`-based version matching implementation for alpine

the alpine version of `grep` doesn't support PCRE

* fix: forgot to strip the leading "v" from the version number

* fix: need `make` package to build from source

* feat: parameterize make options to easily inject Alpine-specific option

* fix: wip: latest baseline (still breaking due to musl)

* feat: add basic scaffolding for alpine, based on debian implementation

note: this won't install from source (due to build issues with musl) but will install using the `apk` package manager

* chore: chmod +x

* chore: bump semver (proposed)

* docs: add Alpine/apk to notes

* test: add test for `alpine:3` to install system package

note: feature does not currently implement building from source on Alpine

* fix: working build from source!

still need to tweak the package dependencies and make config

* perf: remove OBE `gettext-dev` package from dependencies

no longer required with "NO_GETTEXT=YesPlease" make config

* perf: remove OBE `libintl` package from dependencies

no longer required with "NO_GETTEXT=YesPlease" make config (?)

* feat: add remaining make options from apk package source reference

* docs: add refs. for alpine build from source

* test(git): add test case for building git from src on alpine:3

* fix: lint: SC2068: Double quote array expansions to avoid re-splitting elements

* fix: use Devcontainer Alpine image as base (because it has `bash` installed); refactor test script names to remove major version suffix (since it isn't specified in the associated image tag)

* perf: consolidate to a single, jq-based implementation

using `jq` avoids the need for PCRE `grep` expression (not supported in Alpine)

* fix: set `sysconfdir` option for alpine build as well

see [#395](https://github.com/devcontainers/features/pull/395)

* test: fix: alpine doesn't include perl support; leverage test cases from `install_git_from_src.sh` script

* style: remove unused options

* fix: set `prefix` option for alpine build to be consistent with other builds

see [#395](https://github.com/devcontainers/features/pull/395)

* refactor: move common arguments out of distro-specific logic

* perf: minimum set of make options for building git from source in Alpine

* chore: remove OBE code (unused make options for Git)

* style: whitespace

* test: fix: remove `gettext` check (since this package isn't installed in Alpine)

* feat: update implementation based on local Git feature in `base-alpine` image

* feat: remove `libsecret-dev` package

not present in local Git feature in `base-alpine` image `install.sh` script

* feat: switch `glib-dev` to `g++` and `gcc` packages, based on local Git feature in `base-alpine` image

* chore: remove `alpine-sdk` package, based on local Git feature in `base-alpine` image

no longer needed, based on initial testing

* revert: switch back to `grep`-based PCRE implementation,  based on local Git feature in `base-alpine` image

`jq` package no longer needed

* test: revert: remove test cases (covered by generic `install_git_from_src.sh`)

* test: fix: remove perl check for system package in Alpine (because the system package is not built with PCRE support)

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Co-authored-by: Samruddhi Khandale <skhandale@microsoft.com>