Adds cert-prune for certbot image

see:
https://github.com/axllent/cert-prune

docker/Dockerfile.certbot

@@ -51,6 +51,9 @@ LABEL maintainer="Jamie Curnow <jc@jc21.com>"
 ARG TARGETPLATFORM
 RUN echo "Certbot: nginxproxymanager/nginx-full:${BASE_TAG:-latest}, ${TARGETPLATFORM:-linux/amd64}" >> /built-for-arch
 
+COPY scripts/install-cert-prune /tmp/install-cert-prune
+RUN /tmp/install-cert-prune "${TARGETPLATFORM:-linux/amd64}" && rm -f /tmp/install-cert-prune
+
 # OpenResty uses LuaJIT which has a dependency on GCC
 RUN apt-get update \
 	&& apt-get install -y --no-install-recommends \

scripts/install-cert-prune

@@ -0,0 +1,38 @@
+#!/bin/bash -e
+
+# Note: This script is designed to be run inside a Docker Build for a container
+
+CYAN='\E[1;36m'
+YELLOW='\E[1;33m'
+BLUE='\E[1;34m'
+GREEN='\E[1;32m'
+RESET='\E[0m'
+
+CERT_PRUNE_VERSION=0.0.1
+TARGETPLATFORM=$1
+
+# Determine the correct binary file for the architecture given
+case $TARGETPLATFORM in
+	linux/arm64)
+		ARCH=arm64
+		;;
+
+	linux/arm/v7)
+		ARCH=arm
+		;;
+
+	*)
+		ARCH=amd64
+		;;
+esac
+
+echo -e "${BLUE}❯ ${CYAN}Installing cert-prune v${CERT_PRUNE_VERSION} for ${YELLOW}${TARGETPLATFORM} (${ARCH})${RESET}"
+
+mkdir -p /tmp/cert-prune
+cd /tmp/cert-prune
+curl -L -o 'cert-prune.tar.gz' "https://github.com/axllent/cert-prune/releases/download/${CERT_PRUNE_VERSION}/cert-prune-linux-${ARCH}.tar.gz"
+tar -xzf 'cert-prune.tar.gz'
+mv cert-prune /bin/
+rm -rf /tmp/cert-prune
+
+echo -e "${BLUE}❯ ${GREEN}cert-prune install Complete${RESET}"