feat: Add example build for Okta authentication

Dockerfile

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+FROM azul/zulu-openjdk-alpine@sha256:a36679ac0d28cb835e2a8c00e1e0d95509c6c51c5081c7782b85edb1f37a771a
+
+RUN apk add --no-cache \
+    # snappy codec
+    gcompat \
+    # configuring timezones
+    tzdata \
+    # bash
+    bash
+
+RUN mkdir -p /app/kafka-ui
+
+COPY example/config /app/kafka-ui/config
+COPY example/entrypoint.sh /app/kafka-ui/entrypoint.sh
+COPY kafka-ui-api/target/kafka-ui-api-0.0.1-SNAPSHOT.jar /app/kafka-ui/kafka-ui-api.jar
+
+RUN chmod +x /app/kafka-ui/entrypoint.sh
+
+EXPOSE 8080
+
+WORKDIR /app/kafka-ui
+
+ENTRYPOINT ["./entrypoint.sh"]
+

build.sh

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+#!/bin/bash
+./mvnw -pl kafka-ui-api -am -Dmaven.test.skip=true -Ddocker.skip=true -Dcheckstyle.skip clean package -Pprod

example/config/application-test.yml

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+auth:
+  type: OAUTH2
+  oauth2:
+    client:
+      okta:
+        clientId: <client-id>
+        clientSecret: <client-secret>
+        scope: [ 'openid', 'profile', 'email', 'groups' ]
+        client-name: Okta
+        provider: okta
+        redirect-uri: "{baseUrl}/login/oauth2/code/okta"
+        authorization-grant-type: authorization_code
+        issuer-uri: https://<okta-endpoint>
+        authorization-uri: <okta-endpoint>/oauth2/v1/authorize
+        token-uri: <okta-endpoint>/oauth2/v1/token
+        user-info-uri: <okta-endpoint>/oauth2/v1/userinfo
+        jwk-set-uri: <okta-endpoint>/oauth2/v1/keys
+        user-name-attribute: email
+        custom-params:
+          type: oauth
+          roles-field: groups
+server:
+  port: 8080

example/entrypoint.sh

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+#!/bin/bash
+# Configure proxy Java options
+PROXY_JAVA_OPTS=''
+if [[ -n $PROXY_HOST && -n $PROXY_PORT ]]; then
+    PROXY_JAVA_OPTS="$PROXY_JAVA_OPTS -Dhttp.proxyHost=$PROXY_HOST -Dhttp.proxyPort=$PROXY_PORT -Dhttps.proxyHost=$PROXY_HOST -Dhttps.proxyPort=$PROXY_PORT"
+fi
+if [[ -n $NON_PROXY_HOSTS ]]; then
+    PROXY_JAVA_OPTS="$PROXY_JAVA_OPTS -Dhttp.nonProxyHosts=$NON_PROXY_HOSTS -Dhttps.nonProxyHosts=$NON_PROXY_HOSTS"
+fi
+
+CMD="java --add-opens java.rmi/javax.rmi.ssl=ALL-UNNAMED $PROXY_JAVA_OPTS -jar -Dspring.profiles.active=test kafka-ui-api.jar"
+echo "Starting Kafka UI with command : $CMD"
+
+eval "exec $CMD"