Disable SSL for database connections on private network (#97)

Every timeout stack trace pointed at ssl_gen_statem.call/2 — the OTP 27
SSL gen_statem hanging during recv. PG is on private network (10.0.15.20)
and SSL verify was already disabled (verify_none), providing no security
benefit while adding CPU overhead and the gen_statem layer that caused
all connection timeouts.

Removed DATABASE_SSL and DATABASE_SSL_VERIFY env vars from both the
init container and main container. Also disabled SSL on the PG server
(ssl=off in postgresql.conf, hostssl→host in pg_hba.conf).

Reviewed-on: graham/towerops-web#97

k8s/deployment.yaml

@@ -47,10 +47,6 @@ spec:
           env:
             - name: MIX_ENV
               value: "prod"
-            - name: DATABASE_SSL
-              value: "true"
-            - name: DATABASE_SSL_VERIFY
-              value: "false"
             - name: RELEASE_COOKIE
               valueFrom:
                 secretKeyRef:
@@ -173,10 +169,6 @@ spec:
                 secretKeyRef:
                   name: towerops-secrets
                   key: CLOAK_KEY
-            - name: DATABASE_SSL
-              value: "true"
-            - name: DATABASE_SSL_VERIFY
-              value: "false"
             - name: STRIPE_SECRET_KEY
               valueFrom:
                 secretKeyRef: