feat(android_dev): Add tmux and auto-start dev session

[menny]

Installs tmux in the android_dev image.

Adds a script that, on login, automatically starts a tmux session named dev-session or attaches to it if it already exists. This streamlines the development workflow by ensuring the user is always in a tmux session.

[github-actions]

Image size for menny/android_base:1.21.5 is 1.4G (or 1361435889 bytes). Layers 29. Size before squashing: 1362463762 Previous (compressed) size was 726835524.

[github-actions]

Image size for menny/android:1.21.5 is 1.7G (or 1617307794 bytes). No squash. Previous (compressed) size was 847511297.

[github-actions]

Image size for menny/android_bazel:1.21.5 is 2.2G (or 2121354095 bytes). No squash. Previous (compressed) size was 1038447350.

[github-actions]

Image size for menny/android_base:1.21.6 is 1.4G (or 1361435889 bytes). Layers 29. Size before squashing: 1362463762 Previous (compressed) size was 726835524.

[github-actions]

Image size for menny/android:1.21.6 is 1.7G (or 1617307794 bytes). No squash. Previous (compressed) size was 847511297.

[github-actions]

Image size for menny/android_bazel:1.21.6 is 2.2G (or 2121354096 bytes). No squash. Previous (compressed) size was 1038447350.

[github-actions]

Image size for menny/android_dev:1.21.5 is 2.6G (or 2529445091 bytes). No squash. Previous (compressed) size was 1183320970.

[github-actions]

Image size for menny/android_dev:1.21.6 is 2.6G (or 2529445084 bytes). No squash. Previous (compressed) size was 1183320970.

[github-actions]

Image size for menny/android_base:1.21.6 is 1.4G (or 1361435889 bytes). Layers 29. Size before squashing: 1362463762 Previous (compressed) size was 726835524.

[github-actions]

Image size for menny/android:1.21.6 is 1.7G (or 1617307794 bytes). No squash. Previous (compressed) size was 847511297.

[github-actions]

Image size for menny/android_bazel:1.21.6 is 2.2G (or 2121354092 bytes). No squash. Previous (compressed) size was 1038447350.

[github-actions]

Image size for menny/android_dev:1.21.6 is 2.6G (or 2529444520 bytes). No squash. Previous (compressed) size was 1183320970.