Merge pull request #42 from beeware/flatpak-exec #91

Job	Run time
Pre-commit checks / Pre-commit Checks	10s
Build apps (3.10, ppb) / Verify App Build	2m 36s
Build apps (3.10, pygame) / Verify App Build	3m 20s
Build apps (3.10, pyside6) / Verify App Build	5m 7s
Build apps (3.10, toga) / Verify App Build	3m 25s
Build apps (3.11, ppb) / Verify App Build	2m 58s
Build apps (3.11, pygame) / Verify App Build	2m 41s
Build apps (3.11, pyside6) / Verify App Build	5m 0s
Build apps (3.11, toga) / Verify App Build	3m 11s
Build apps (3.12, ppb) / Verify App Build	3m 2s
Build apps (3.12, pyside6) / Verify App Build	4m 46s
Build apps (3.12, pygame) / Verify App Build	3m 14s
Build apps (3.12, toga) / Verify App Build	3m 39s
Build apps (3.8, ppb) / Verify App Build	3m 14s
Build apps (3.8, pygame) / Verify App Build	2m 43s
Build apps (3.8, pyside6) / Verify App Build	5m 1s
Build apps (3.8, toga) / Verify App Build	3m 50s
Build apps (3.9, pygame) / Verify App Build	2m 46s
Build apps (3.9, pyside6) / Verify App Build	4m 31s
Build apps (3.9, toga) / Verify App Build	3m 6s
Build apps (3.9, ppb) / Verify App Build	2m 44s
	1h 11m 4s

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