CI: fix workflow startup_failure (matrix context in shell:)#1
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`shell: ${{ matrix.shell }}` is invalid -- the matrix context is not available in a step's shell: key, so GitHub rejects the workflow at parse time. That's a startup_failure: the whole run dies before any job starts, so BOTH matrix legs showed red with zero jobs and zero logs (runs even fired on non-main branches, since the branch filter never got evaluated). Broken since b1758f4 added the WinPS 5.1 leg.
Select the shell with two if-guarded run steps instead; matrix IS allowed in if:. Verified with actionlint (clean) and by running the full Pester suite on both pwsh 7 and Windows PowerShell 5.1 locally.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Problem
CI has failed on every push since
b1758f4d("add Windows PowerShell 5.1 test leg"). Every run was astartup_failure: zero jobs, zero logs, both matrix legs red — and runs even fired on non-mainbranches, because GitHub couldn't parse the workflow far enough to apply the branch filter.Root cause
The
matrixcontext is not available in a step'sshell:key, so GitHub rejects the workflow at parse time — killing the entire run before any job starts. (actionlintflags exactly this line.) The tests themselves were never broken; they pass on both pwsh 7 and WinPS 5.1.Fix
Select the shell with two
if-guarded run steps (matrixis allowed inif:).Verification
actionlintclean (exit 0) on the fixed file.🤖 Generated with Claude Code