Feature add Postgres WAL support and a custom Repo - #10

test unsubscribe/1 unsubscribe from updates (EctoSyncTest)

test watchers/3 :assocs option with keyword assocs (EctoSyncTest)

test EctoSync.Repo inserts from other process is received (EctoSync.RepoTest)

test EctoSync.Repo.__prepare_op__ invalid changesets will decrement local counter (EctoSync.RepoTest)

test EctoSync.Repo assoc updates are not received from own process (EctoSync.RepoTest)

test EctoSync.Repo updates from other process is received (EctoSync.RepoTest)

test EctoSync.Repo own updates are not received (EctoSync.RepoTest)

test EctoSync.Repo.__prepare_op__ raises will decrement the local counter (EctoSync.RepoTest)

test EctoSync.Repo.__prepare_op__ if primary key is set, it won't be overridden (EctoSync.RepoTest)

test postgres WAL adapter events are sent (EctoSyncTest.AdapterTests)

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache@v4, actions/checkout@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/