roles/postgresql-server: Deploy PostgreSQL

The *postgresql-server* role installs and configures PostgreSQL on
Fedora/RHEL-based distributions.

roles/postgresql-server/templates/pg_hba.conf.j2

@@ -0,0 +1,7 @@
+{#- vim: set ft=jinja : -#}
+# TYPE    DATABASE        USER            ADDRESS                 METHOD
+{% for auth in pg_hba_extra|d({}) %}
+{{ '{type: <9} {database: <15} {user: <15} {address: <23} {method}'.format(**auth) }}
+{% endfor %}
+local     all             postgres                                peer
+local     sameuser        all                                     peer

roles/postgresql-server/templates/pg_ident.conf.j2

@@ -0,0 +1,3 @@
+{% for item in pg_ident %}
+{{ item.mapname }}	{{ item.system_user }}	{{ item.pg_user }}
+{% endfor %}

roles/postgresql-server/templates/postgresql-setup.service.j2

@@ -0,0 +1,11 @@
+[Unit]
+Before=postgresql.service
+
+[Service]
+Type=oneshot
+RemainAfterExit=true
+Environment=PGDATA={{ pgdata_dir }}
+Environment=LANG={{ pg_locale }}
+User=postgres
+Group=postgres
+ExecStart=/bin/sh -c "[ -f ${PGDATA}/PG_VERSION ] || initdb -D ${PGDATA}"