Add postgres support (#135)

Revert fixture fixes for postgres

Use postgres connection string with spaces instead of url

Fix label order

Make postgres tests in ci less verbose

Add sequence update script

Skip resets in postgres

Remove option to skip resets in postgres

Make postgres tests in ci verboseq

Update test fixtures database

Fix file tests on postgres

Add postgres options to sample config

Make sure tests init test fixtures before running the actual tests

Fix issues with IDs too big to fit in an int

Fix duplicate auto incremented IDs

Refactor / Fix team tests

Refactor team member tests

Fix team member create

Fix label test

Fix getting labels

Fix test fixtures for postgresql

Fix connection string params

Disable ssl mode on postgres integration tests

Disable ssl mode on postgres tests

Use sprintf to create the connection string for postgresql

fixup! Add postgres support

Add postgres support

Added generate as a make dependency for make build

Clarify docs on building

Co-authored-by: kolaente <k@knt.li>
Co-authored-by: Jan Tojnar <jtojnar@gmail.com>
Reviewed-on: https://kolaente.dev/vikunja/api/pulls/135

docs/content/doc/setup/backups.md

@@ -29,6 +29,24 @@ To restore it, simply pipe it back into the `mysql` command:
 mysql -u <user> -p -h <db-host> <database> < vkunja-backup.sql
 {{< /highlight >}}
 
+## PostgreSQL
+
+To create a backup from PostgreSQL use the `pg_dump` command:
+
+{{< highlight bash >}}
+pg_dump -U <user> -h <db-host> <database> > vikunja-backup.sql
+{{< /highlight >}}
+
+You might be prompted for the password of the database user.
+
+To restore it, simply pipe it back into the `psql` command:
+
+{{< highlight bash >}}
+psql -U <user> -h <db-host> <database> < vikunja-backup.sql
+{{< /highlight >}}
+
+For more information, please visit the [relevant PostgreSQL documentation](https://www.postgresql.org/docs/12/backup-dump.html).
+
 ## SQLite
 
 To backup sqllite databases, it is enough to copy the database elsewhere.