Add an --app= flag for specifying the WSGI application #337

Job	Run time
Lint the package	34s
Validate coverage	44s
Python: 3.9-x64 on ubuntu-22.04	28s
Python: 3.9-x64 on windows-latest	1m 10s
Build the documentation	29s
Python: 3.9-x86 on windows-latest	1m 35s
Python: 3.9-arm64 on macos-14	49s
Python: 3.9-x64 on macos-13	38s
Python: 3.10-x64 on ubuntu-22.04	27s
Python: 3.10-x64 on windows-latest	1m 11s
Python: 3.10-x86 on windows-latest	1m 12s
Python: 3.10-arm64 on macos-14	39s
Python: 3.10-x64 on macos-13	39s
Python: 3.11-x64 on ubuntu-22.04	28s
Python: 3.11-x64 on windows-latest	1m 26s
Python: 3.11-x86 on windows-latest	1m 30s
Python: 3.11-x64 on macos-14	42s
Python: 3.11-arm64 on macos-14	29s
Python: 3.11-x64 on macos-13	37s
Python: 3.12-x64 on ubuntu-22.04	32s
Python: 3.12-x64 on windows-latest	1m 10s
Python: 3.12-x86 on windows-latest	1m 34s
Python: 3.12-x64 on macos-14	48s
Python: 3.12-arm64 on macos-14	26s
Python: 3.12-x64 on macos-13	43s
Python: 3.13-x64 on ubuntu-22.04	37s
Python: 3.13-x64 on windows-latest	1m 46s
Python: 3.13-x86 on windows-latest	2m 17s
Python: 3.13-x64 on macos-14	45s
Python: 3.13-arm64 on macos-14	26s
Python: 3.13-x64 on macos-13	50s
Python: pypy-3.9-x64 on ubuntu-22.04	42s
Python: pypy-3.10-x64 on ubuntu-22.04	45s
Python: pypy-3.10-x64 on windows-latest	2m 6s
Python: pypy-3.10-x86 on windows-latest	2m 7s
Python: pypy-3.10-x64 on macos-14	1m 42s
Python: pypy-3.10-arm64 on macos-14	58s
Python: pypy-3.10-x64 on macos-13	52s
	36m 53s

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