Init keycloak dokku experiment

Dockerfile

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+FROM jboss/keycloak:9.0.0

app.json

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+{
+  "name": "keycloak",
+  "description": "Open Source Identity and Access Management",
+  "repository": "https://gitlab.com/autonomic-cooperative/gitea-experiment",
+  "success_url": "/",
+  "dokku": {
+    "plugins": [
+      {
+        "name": "domains",
+        "commands": [
+          "domains:add keycloak keycloak.gitea-experiment.autonomic.zone"
+        ]
+      },
+      {
+        "name": "letsencrypt",
+        "commands": ["letsencrypt keycloak", "letsencrypt:cron-job --add"]
+      }
+    ]
+  }
+}