feat: add --only (#1098)

* fix(style): use sub recommended replacement method

See https://docs.python.org/3/library/re.html#re.escape

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* feat: add --build

* refactor: switch to using --only

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* docs: cover --only

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* docs: undo change to --plat for auditwheel

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* (unrelated) speed up running the unit tests

based on a profile run, this speeds up the unit tests by 3x

* Remove `intercepted_build_args` reliance on `platform` fixture

* Add test that checks if 'only' overrides env var options

* Ensure that the --only command line option overrides env vars

* Fix UnboundLocalError

* Test cleanups

* style: typing.cast instead of plain cast

* feat: add only: to the GHA

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>
Co-authored-by: Joe Rickerby <joerick@mac.com>

docs/options.md

@@ -113,7 +113,7 @@ The complete set of defaults for the current version of cibuildwheel are shown b
 
 !!! tip
     Static configuration works across all CI systems, and can be used locally if
-    you run `cibuildwheel --plat linux`. This is preferred, but environment
+    you run `cibuildwheel --platform linux`. This is preferred, but environment
     variables are better if you need to change per-matrix element
     (`CIBW_BUILD` is often in this category, for example), or if you cannot or do
     not want to change a `pyproject.toml` file. You can specify a different file to
@@ -202,6 +202,10 @@ This option can also be set using the [command-line option](#command-line) `--pl
 
     This is even more convenient if you store your cibuildwheel config in [`pyproject.toml`](#configuration-file).
 
+    You can also run a single identifier with `--only <identifier>`. This will
+    not require `--platform` or `--arch`, and will override any build/skip
+    configuration.
+
 ### `CIBW_BUILD`, `CIBW_SKIP` {: #build-skip}
 
 > Choose the Python versions to build