ci: run aarch64 jobs on GitHub-hosted runners

The main idea behind this switch is to have less of our own
infrastructure to support.

We added our own aarch64 runners before GitHub started to provide them
natively [1] and, in fact, never wanted to spend time on them.

A big advantage of GitHub-hosted runners is that they're created per
job. Ours are long-lived machines, and a bad job may break the jobs
after it. This is a constant source of problems we have to work around:
the CodeQL workflow has to clean up the CodeQL bundles it downloads so
as not to fill the whole disk; the environment action kills test
processes left by earlier jobs and cleans up the git repository. We even
have the special `prepare-checkout` action that does some black magic,
so that `actions/checkout` works on a git repository left by a previous
job.

In fact, the runner-per-job approach can be implemented for self-hosted
runners too, see [2] and [3]. But that's the infrastructure work we want
to avoid.

I'd also note that there are providers of GitHub Actions runners besides
GitHub itself, including ones that offer aarch64 runners. So if we find
ourselves in need of more resources, we have options that don't require
managing our own Kubernetes cluster.

All of the above applies to the x86_64 runners too, and I hope we will
move them as well, just later.

Besides `debug_aarch64` and `packaging_build_test_deploy`, which run in
tarantool CI, this commit adjusts `luajit-integration`, which is called
from tarantool/luajit CI (as is `debug_aarch64`). This way we move part
of LuaJIT's CI to GitHub-hosted runners.

[1]: https://github.blog/changelog/2025-01-16-linux-arm64-hosted-runners-now-available-for-free-in-public-repositories-public-preview/
[2]: https://github.blog/changelog/2021-09-20-github-actions-ephemeral-self-hosted-runners-new-webhooks-for-auto-scaling/
[3]: actions/actions-runner-controller#2174

Drafted by an LLM, conducted and corrected by the commit author.

NO_DOC=ci
NO_TEST=ci
NO_CHANGELOG=ci

Author: Totktonada

.github/actions/environment/action.yml

@@ -102,13 +102,19 @@ runs:
         git clean -xffd
         git submodule foreach --recursive 'git clean -xffd'
 
+        # Limit the size of the LuaJIT tests' work directory on self-hosted
+        # runners.
+        #
+        # The reason is that in bad circumstances a profiler test (sysprof
+        # or memprof) may write a huge profile file.
+        #
+        # Generally, it is harmless (only the job fails), but our
+        # self-hosted runners are reused between jobs and a filled disk may
+        # cause other jobs to fail.
+        #
         # See for details: https://github.com/tarantool/tarantool/issues/7472.
-        # However, this workaround doesn't work on our aarch64 runners due to
-        # the following error:
-        #     mount: /tmp/luajit-test-vardir: mount failed: Operation not permitted
-        # Looks like it happens because our aarch64 runners are LXD containers.
-        if ${{ runner.os == 'Linux' && runner.arch != 'ARM64' &&
-               !contains(runner.name, 'GitHub Actions') }}; then
+        if ${{ runner.os == 'Linux' &&
+               runner.environment == 'self-hosted' }}; then
             LUAJIT_TEST_VARDIR=/tmp/luajit-test-vardir
             LUAJIT_TEST_VARDIR_DISK=/tmp/luajit-test-vardir-disk/disk.ext4
 

.github/workflows/debug_aarch64.yml

@@ -53,7 +53,7 @@ jobs:
         ( github.event_name != 'pull_request' ||
           contains(github.event.pull_request.labels.*.name, 'full-ci') )
 
-    runs-on: graviton
+    runs-on: ubuntu-26.04-arm
 
     timeout-minutes: 60
 

.github/workflows/luajit-integration.yml

@@ -49,7 +49,10 @@ on:
 
 jobs:
   luajit-integration:
-    runs-on: [self-hosted, regular, '${{ inputs.os }}', '${{ inputs.arch }}']
+    runs-on: ${{ inputs.os == 'Linux' && inputs.arch == 'ARM64' &&
+                 'ubuntu-26.04-arm' ||
+                 fromJSON(format('["self-hosted", "regular", "{0}", "{1}"]',
+                                 inputs.os, inputs.arch)) }}
     timeout-minutes: 60
     steps:
       - name: Prepare checkout

.github/workflows/packaging_build_test_deploy.yml

@@ -16,7 +16,8 @@ on:
 
 jobs:
   build:
-    runs-on: [ self-hosted, Linux, '${{ inputs.arch }}', regular ]
+    runs-on: ${{ inputs.arch == 'aarch64' && 'ubuntu-26.04-arm' ||
+                 fromJSON('["self-hosted", "Linux", "x86_64", "regular"]') }}
 
     timeout-minutes: 60
 
@@ -71,7 +72,8 @@ jobs:
           bot-token: ${{ secrets.VKTEAMS_BOT_TOKEN }}
 
   test:
-    runs-on: [ self-hosted, Linux, '${{ inputs.arch }}', regular ]
+    runs-on: ${{ inputs.arch == 'aarch64' && 'ubuntu-26.04-arm' ||
+                 fromJSON('["self-hosted", "Linux", "x86_64", "regular"]') }}
 
     timeout-minutes: 60