Improve "Cannot read .cabal file inside ..." errors #8879

Job	Run time
Build statically linked using alpine	12m 15s
Validate windows-latest ghc-9.10.1	20m 40s
Validate windows-latest ghc-9.8.2	15m 13s
Validate windows-latest ghc-9.6.6	20m 56s
Validate windows-latest ghc-9.4.8	20m 12s
Validate windows-latest ghc-9.2.8	23m 13s
Validate ubuntu-22.04 ghc-9.10.1	10m 17s
Validate ubuntu-22.04 ghc-9.8.2	12m 36s
Validate ubuntu-22.04 ghc-9.6.6	11m 37s
Validate ubuntu-22.04 ghc-9.4.8	13m 54s
Validate ubuntu-22.04 ghc-9.2.8	16m 34s
Validate ubuntu-22.04 ghc-9.0.2	18m 3s
Validate ubuntu-22.04 ghc-8.10.7	19m 0s
Validate ubuntu-22.04 ghc-8.8.4	18m 22s
Validate macos-latest ghc-9.10.1	11m 58s
Validate macos-latest ghc-9.8.2	16m 14s
Validate macos-latest ghc-9.6.6	12m 15s
Validate macos-latest ghc-9.4.8	15m 19s
Validate macos-latest ghc-9.2.8	16m 5s
Dogfooding ${{ matrix.sys.os }} ghc-${{ matrix.ghc }}	0s
Validate old ghcs ${{ matrix.extra-ghc }}	0s
Validate post job	1s
Create a GitHub LTS prerelease with the binary artifacts	0s
Create a GitHub prerelease with the binary artifacts	0s
	5h 4m 44s

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