[ruby-core:113854] ruby/ruby Cirrus CI improvement

Hello Fedor @ Cirrus CI,
CC: Ruby Core mailing list.

Thank you for helping the Ruby project for adding Cirrus CI. I am
sending an email to ask you for help to improve the Cirrus CI. We are
running 4 parallel jobs (2 gcc cases ARM, 2 clang cases ARM) in the
Cirrus CI.
However, I am seeing some challenges such as the queue is stopping,
and the clang cases are 2 or 3 times slower than gcc cases. So, today
we stopped the 2 clang cases in a compromised way.

Could you check our .cirrus.yml file on the reverted commit, and give
advice to us and ideally just send a pull-request to the master branch
for that?

https://github.com/ruby/ruby/blob/master/.cirrus.yml

```
$ git clone https://github.com/ruby/ruby.git
$ cd ruby
$ git revert 72f07f0a5f882e87e305d668587152fa209a0568.
```

I suspect the current `cpu:` value might not be correct. And we may
need the following change.

```
diff --git a/.cirrus.yml b/.cirrus.yml
index be76e4ab4a..8b820be1a2 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -16,10 +16,10 @@ task:
     image: ghcr.io/ruby/ruby-ci-image:$CC
     # Define the used cpu core in each matrix task. We can use total 16 cpu
     # cores in entire matrix. [cpu] = [total cpu: 16] / [number of tasks]
-    cpu: 8
+    cpu: 4
     # We can request maximum 4 GB per cpu.
     # [memory per task] = [memory per cpu: 4 GB] * [cpu]
-    memory: 32G
+    memory: 16G
   env:
     CIRRUS_CLONE_DEPTH: 50
     optflags: '-O1'
@@ -71,10 +71,10 @@ yjit_task:
     image: ghcr.io/ruby/ruby-ci-image:$CC
     # Define the used cpu core in each matrix task. We can use total 16 cpu
     # cores in entire matrix. [cpu] = [total cpu: 16] / [number of tasks]
-    cpu: 8
+    cpu: 4
     # We can request maximum 4 GB per cpu.
     # [memory per task] = [memory per cpu: 4 GB] * [cpu]
-    memory: 32G
+    memory: 16G
   env:
     CIRRUS_CLONE_DEPTH: 50
     optflags: '-O1'
```

Thank you for your help!

-- 
Jun | He - Him | Timezone: UTC+1 or 2, Czech Republic
See <https://www.worldtimebuddy.com/czech-republic-prague-to-utc> for
the timezone.

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