integration: use postgres instead of redis for tests (#3390)

* integration: use postgres instead of redis for tests

* add missing environment variables for kubernetes

* fix certs

* use cert in generated files

* try new keys

* fix certs

integration/tpl/backends/postgres.libsonnet

@@ -0,0 +1,43 @@
+local utils = import '../utils.libsonnet';
+
+function() {
+  local name = 'postgres',
+  local image = 'postgres:14.3-alpine',
+  local env = {
+    POSTGRES_USER: 'pomerium',
+    POSTGRES_PASSWORD: 'password',
+    POSTGRES_DB: 'test',
+  },
+
+  compose: {
+    services:
+      utils.ComposeService(name, {
+        image: image,
+        environment: env,
+      }) +
+      utils.ComposeService(name + '-ready', {
+        image: 'jwilder/dockerize:0.6.1',
+        command: [
+          '-wait',
+          'tcp://' + name + ':5432',
+          '-timeout',
+          '10m',
+        ],
+      }),
+  },
+  kubernetes: [
+    utils.KubernetesDeployment(name, {
+      image: image,
+      ports: [
+        { name: 'tcp', containerPort: 5432 },
+      ],
+      env: [
+        { name: k, value: env[k] }
+        for k in std.objectFields(env)
+      ],
+    }),
+    utils.KubernetesService(name, [
+      { name: 'tcp', port: 5432, targetPort: 'tcp' },
+    ]),
+  ],
+}