fix: update to apt-archive for pg11 on ubuntu focal (#596)

Author: JacobCoffee

salt/postgresql/base/init.sls

@@ -12,6 +12,20 @@ postgresql-repo:
     - require:
       - file: postgresql-key
     - file: /etc/apt/sources.list.d/postgresql.list
+{% elif grains["oscodename"] == "focal" %}
+postgresql-key:
+  file.managed:
+    - name: /etc/apt/keyrings/postgresql.asc
+    - mode: "0644"
+    - source: salt://postgresql/base/APT-GPG-KEY-POSTGRESQL
+
+postgresql-repo:
+  pkgrepo.managed:
+    - name: "deb [signed-by=/etc/apt/keyrings/postgresql.asc arch={{ grains["osarch"] }}] https://apt-archive.postgresql.org/pub/repos/apt {{ grains['oscodename'] }}-pgdg main"
+    - aptkey: False
+    - require:
+      - file: postgresql-key
+    - file: /etc/apt/sources.list.d/postgresql.list
 {% else %}
 postgresql-repo:
   pkgrepo.managed: