Fix linux arm compiling and add CI for cross-compiled builds

[devm33]

This PR fixes the cross-compilation for linux arm builds to correctly use the sysroot and adds CI for cross-compiling.

The added CI caught an issue that the cross-compiled build was not correctly using the sysroot and linking against the wrong GLIBC version. Installing the correct cross-compilation toolchain fixes that.

Also fixes a duplicate trailing slash here:

node-pty/src/utils.ts

Line 20 in 772905e

const dir = `${r}/${d}/`;

Used here:

node-pty/src/unixTerminal.ts

Line 17 in 772905e

let helperPath = native.dir + '/spawn-helper';

• Follow up to Add sysroot to compile Linux prebuilds against glibc 2.28 #853
• cc Add prebuilt linux binaries with minimal glibc dependency #851
• Fixes Prebuilt binary for Linux ARM is actually x86-64 #860

[rzhao271]

Could testing and linting be re-enabled in this case, or would it be redundant?
Everything else LGTM.

[devm33]

linting would be redundant (already is redundant to lint on each OS)

testing wouldn't work since it's cross-compiling. I think in order to test it would either need to be done in a container or with emulation. Or if there were linux-arm, windows-arm, and macos-x64 runners available that would be easiest

[lydell]

GitHub Actions has Linux ARM and macOS x64 runners (but not Windows ARM):

https://docs.github.com/en/actions/reference/workflows-and-actions/workflow-syntax#standard-github-hosted-runners-for-public-repositories

• macos-15-intel
• ubuntu-22.04-arm and ubuntu-24.04-arm

[devm33]

Followed up on this using all native runners instead of cross-compiling: #865