supabase / supavisor / 16392477779
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feat: support manually written appups (#703)

This change allows us to write (and version) appups instead of using
distillery to gen Supavisor's appups.

It's something that we may need in some cases, e.g.: the update from
v2.0.21 to v2.1.x requires a few dependency bumps. If we write the
appups for these dependencies, we can run a soft deploy.

### Expected flow

**Whenever you can, use the auto-generated appup**, with
`UPGRADE_FROM=x.y.z mix release`. When you can't, you may use manual
appups:

1. Determine the supavisor version upgrade path. E.g.: `2.0.21-2.1.3`.
Create a directory for this upgrade path on `relups`. Inside it, create
an `appups` directory.
2. Generate the necessary appups with `mix supavisor.gen.appup`. For
example, `mix supavisor.gen.appup --app=phoenix_live_view --from=0.20.17
--to=1.0.2 --path=relups/2.0.21-2.1.3/appups`. At this point, the
directory structure will look somewhat like this:
```
relups
└── 2.0.21-2.1.3
    └── appups
        ├── libcluster-3.5.0.appup
        ├── meck-1.0.0.appup
        ├── phoenix_live_view-1.0.2.appup
        ├── supavisor-2.1.3.appup
        └── telemetry_metrics-1.1.0.appup
```
3. Run `UPGRADE_FROM=x.y.z mix release` as usual. The assembled release
will use the appups from the directory above. If you missed some appup,
it will complain here.
4. **Review/test the upgrade process extensively**. A broken relup can
cause issues, and since the rollback is part of the relup, chances are
that if the upgrade is broken, the downgrade is broken as well.
5. Commit the appups and soft deploy.

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Jobs
ID Job ID Ran Files Coverage
1 run-tests - 16392477779.1 56
52.92
 GitHub Action Run
2 run-integration - 16392477779.2 56
37.03
 GitHub Action Run
Source Files on build 16392477779