Add armv7-unknown-linux-musleabihf host tools to CI

[alex]

Related to rust-lang/rustup#3398

try-job: dist-armv7-linux-musl

[rustbot]

r? @Mark-Simulacrum

rustbot has assigned @Mark-Simulacrum.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

[alex]

I know there's a command to run a particular CI runner, but a) I don't know the syntax, b) not sure if I have permissions to do it?

[workingjubilee]

Let's make sure you can do that:

@bors2 delegate=try

@alex Generally you edit your PR desc so it has

try-job: job

And then @ bors2 try

See

rust/src/ci/citool/src/main.rs

Lines 55 to 63 in e314b97

	/// Tries to parse patterns of CI jobs that should be executed
	/// from the commit message of the passed GitHub context
	///
	/// They can be specified in the form of
	/// try-job: <job-pattern>
	/// or
	/// try-job: `<job-pattern>`
	/// (to avoid GitHub rendering the glob patterns as Markdown)
	fn get_try_job_patterns(&self) -> Vec<String> {

[rust-bors]

@alex can now perform try builds on this pull request

[alex]

@bors2 try

[rust-bors]

⌛ Trying commit 0f7f1ba with merge f285d4c…

To cancel the try build, run the command @bors2 try cancel.

[rust-bors]

💔 Test failed

• CI ❌

[alex]

@bors2 try

[rust-bors]

⌛ Trying commit 9307946 with merge cbfa86a…

To cancel the try build, run the command @bors2 try cancel.

[rust-bors]

☀️ Try build successful (CI)
Build commit: cbfa86a (cbfa86ae9d01dbbaf62d3c0f479a7fd7cfda2c14, parent: 68ac5abb067806a88464ddbfbd3c7eec877b488d)