Implement experimental PostgreSQL store (#1939)

* migrate sqlite store to
 generic sql store

* fix conflicts

* init postgres store

* Add postgres store tests

* Refactor postgres store engine name

* fix tests

* Run postgres store tests on linux only

* fix tests

* Refactor

* cascade policy rules on policy deletion

* fix tests

* run postgres cases in new db

* close store connection after tests

* refactor

* using testcontainers

* sync go sum

* remove postgres service

* remove store cleanup

* go mod tidy

* remove env

* use postgres as engine and initialize test store with testcontainer

---------

Co-authored-by: Maycon Santos <mlsmaycon@gmail.com>

.github/workflows/golang-test-linux.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       matrix:
         arch: [ '386','amd64' ]
-        store: [ 'jsonfile', 'sqlite' ]
+        store: [ 'jsonfile', 'sqlite', 'postgres']
     runs-on: ubuntu-latest
     steps:
       - name: Install Go