Keycloak + nginx reverse proxy (#63)

* Example Keycloak config.

* Proxy for geth, ipld-eth-server, and lighthouse.

* Add metrics.

container-build/cerc-keycloak/Dockerfile

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+FROM maven:3-eclipse-temurin-11-alpine AS builder
+RUN apk add --update --no-cache git
+WORKDIR /build
+RUN git clone https://github.com/cerc-io/keycloak-api-key-demo.git && \
+      cd keycloak-api-key-demo && \
+      git checkout '60c48b5c3e562c6cf2c85cfdd8f08145b0ebac5a' && \
+      mvn -f api-key-module package
+
+FROM quay.io/keycloak/keycloak:20.0
+COPY --from=builder /build/keycloak-api-key-demo//api-key-module/target/deploy/*  /opt/keycloak/providers/
+WORKDIR /opt/keycloak/providers
+RUN curl -L https://github.com/aerogear/keycloak-metrics-spi/releases/download/2.5.3/keycloak-metrics-spi-2.5.3.jar --output keycloak-metrics-spi.jar

container-build/cerc-keycloak/build.sh

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+#!/usr/bin/env bash
+#
+#Build cerc/keycloack
+
+# See: https://stackoverflow.com/a/246128/1701505
+SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
+
+docker build -t cerc/keycloak:local ${SCRIPT_DIR}