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231ba1da19
Every `${{ }}` part was spliced as raw text into a synthesized
`format('...', <raw>)` call and re-parsed, so unbalanced parentheses
restructured the whole expression:
```yaml
run-name: ${{ 1) && (2 }} # panicked, aborting workflow parsing for the push
if: x ${{ 1) && (2 }} y # silently evaluated to 2
```
One scanner shaped like GitHub's template reader now splits every value
and each part is evaluated on its own, so nothing builds an expression
out of text. A part that fails is an error instead of an empty string,
making a `run-name`, `runs-on` or job name that GitHub rejects invalid
here too.
Replaces https://github.com/go-gitea/gitea/pull/38736 as the actual root-cause fix.
Signed-off-by: silverwind <me@silverwind.io>