Add an --app= flag for specifying the WSGI application #331

Job	Run time
Validate coverage	43s
Build the documentation	32s
Lint the package	30s
Python: 3.9-x64 on ubuntu-22.04	30s
Python: 3.9-x64 on windows-latest	1m 20s
Python: 3.9-x86 on windows-latest	1m 16s
Python: 3.9-arm64 on macos-14	27s
Python: 3.9-x64 on macos-13	40s
Python: 3.10-x64 on ubuntu-22.04	29s
Python: 3.10-x64 on windows-latest	1m 10s
Python: 3.10-x86 on windows-latest	1m 55s
Python: 3.10-arm64 on macos-14	25s
Python: 3.10-x64 on macos-13	42s
Python: 3.11-x64 on ubuntu-22.04	29s
Python: 3.11-x64 on windows-latest	1m 2s
Python: 3.11-x86 on windows-latest	1m 20s
Python: 3.11-x64 on macos-14	49s
Python: 3.11-arm64 on macos-14	26s
Python: 3.11-x64 on macos-13	40s
Python: 3.12-x64 on ubuntu-22.04	29s
Python: 3.12-x64 on windows-latest	1m 33s
Python: 3.12-x86 on windows-latest	1m 40s
Python: 3.12-x64 on macos-14	42s
Python: 3.12-arm64 on macos-14	26s
Python: 3.12-x64 on macos-13	51s
Python: 3.13-x64 on ubuntu-22.04	40s
Python: 3.13-x64 on windows-latest	1m 56s
Python: 3.13-x86 on windows-latest	2m 5s
Python: 3.13-x64 on macos-14	45s
Python: 3.13-arm64 on macos-14	25s
Python: 3.13-x64 on macos-13	45s
Python: pypy-3.9-x64 on ubuntu-22.04	39s
Python: pypy-3.10-x64 on ubuntu-22.04	41s
Python: pypy-3.10-x64 on windows-latest	2m 1s
Python: pypy-3.10-x86 on windows-latest	2m 0s
Python: pypy-3.10-x64 on macos-14	1m 26s
Python: pypy-3.10-arm64 on macos-14	44s
Python: pypy-3.10-x64 on macos-13	53s
	36m 6s

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