Fix release for GLIBC_2.38 issue (#4268)

# Description of Changes

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here. -->

Our releases are currently broken because the machine that built the
release is based off of ubuntu 24.04. I've now changed it back to
`ubuntu-22.04` so that we don't have this issue.

```
boppy@geralt:~/clockwork/SpacetimeDB/crates/update$ curl -sSf https://install.spacetimedb.com | sh
Downloading installer...
/tmp/tmp.6i9sLQU0ff/spacetime-install: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.38' not found (required by /tmp/tmp.6i9sLQU0ff/spacetime-install)
boppy@geralt:~/clockwork/SpacetimeDB/crates/update$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 22.04.5 LTS
Release:        22.04
Codename:       jammy
```

# API and ABI breaking changes

None

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corresponding GitHub label. -->

# Expected complexity level and risk

1 - we had fixed this before but we (meaning me) broket this again
recently.

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# Testing

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reviewers to do,
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I have not tested this myself but I know this fixes the issue because I
was the one who broke it.

Author: jdetter

.github/workflows/package.yml

@@ -14,7 +14,9 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - { name: x86_64 Linux, target: x86_64-unknown-linux-gnu, runner: spacetimedb-new-runner-2 }
+          # WARNING - do not upgrade this runner to 24.04 or the self hosted runners because it will break downloads for
+          #   anyone who uses a linux distro that doesn't have glibc >= GLIBC_2.38
+          - { name: x86_64 Linux, target: x86_64-unknown-linux-gnu, runner: ubuntu-22.04 }
           - { name: aarch64 Linux, target: aarch64-unknown-linux-gnu, runner: arm-runner }
           # Disabled because musl builds weren't working and we didn't want to investigate. See https://github.com/clockworklabs/SpacetimeDB/pull/2964.
           # - { name: x86_64 Linux musl, target: x86_64-unknown-linux-musl, runner: bare-metal, container: alpine }