Added a bit more automation to build processes (only supported versions)

fpm-alpine/21/Dockerfile

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+FROM nextcloud:21-fpm-alpine
+
+RUN set -ex; \
+ apk add --no-cache --virtual .build-deps \
+	autoconf \
+	automake \
+	file \
+	g++ \
+	gcc \
+	make \
+	php7-dev \
+	re2c \
+	samba-dev \
+	zlib-dev; \
+ apk add --no-cache libsmbclient;  \	
+ pecl install smbclient; \
+ docker-php-ext-enable smbclient; \ 
+ apk add --no-cache imagemagick; \ 
+ apk del .build-deps
+
+COPY redis.config.php /usr/src/nextcloud/config/redis.config.php

fpm-alpine/21/build

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+#!/bin/bash
+
+# define variables.
+IMAGE_VARIANT=fpm-alpine
+IMAGE_VERSION=21
+UPSTREAM_IMAGE=nextcloud
+UPSTREAM_IMAGE_TAG=${IMAGE_VERSION}-${IMAGE_VARIANT}
+IMAGE=bkraul/nextcloud
+
+# set username and password
+# requires vars DOCKER_USER and DOCKER_PASS to be defined before calling.
+
+# useful functions.
+function docker_tag_exists() {
+    TOKEN=$(curl -s -H "Content-Type: application/json" -X POST -d '{"username": "'${DOCKER_USER}'", "password": "'${DOCKER_PASS}'"}' https://hub.docker.com/v2/users/login/ | jq -r .token)
+    curl --silent -f --head -lL https://hub.docker.com/v2/repositories/$1/tags/$2/ > /dev/null
+}
+
+# pull the parent image from docker hub.
+docker pull ${UPSTREAM_IMAGE}:${UPSTREAM_IMAGE_TAG}
+UPSTREAM_ID=$(docker image inspect --format='{{index .Id}}' ${UPSTREAM_IMAGE}:${UPSTREAM_IMAGE_TAG})
+UPSTREAM_ID=${UPSTREAM_ID:7}
+
+# get the version number.
+NEXTCLOUD_VERSION=$(docker inspect ${UPSTREAM_IMAGE}:${UPSTREAM_IMAGE_TAG} | jq -r '.[].Config.Env[] | select(match("^NEXTCLOUD_VERSION"))')
+NEXTCLOUD_VERSION=${NEXTCLOUD_VERSION:18}
+IMAGE_TAG=${NEXTCLOUD_VERSION}-${IMAGE_VARIANT}
+
+if docker_tag_exists ${IMAGE} ${IMAGE_TAG}; then
+    # nothing to do, the image already exists.
+    echo Image ${IMAGE}:${IMAGE_TAG} already exists.
+else
+    exit 0
+    # image doesn't exist we need build and push
+    echo Image ${IMAGE}:${IMAGE_TAG} does not exist.
+    echo "Building image(s)..."
+    docker build $1 \
+      -t ${IMAGE}:${UPSTREAM_IMAGE_TAG} \
+      -t ${IMAGE}:${IMAGE_TAG}
+    if [ $? == 0 ]; then
+      echo "Pushing image(s)..."
+      docker push ${IMAGE}:${IMAGE_TAG}
+      docker push ${IMAGE}:${UPSTREAM_IMAGE_TAG}
+    else
+      echo "The build operation failed."
+      echo "Please debug and try again."
+    fi
+fi

fpm-alpine/21/redis.config.php

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+<?php
+$CONFIG = array (
+  'memcache.locking' => '\OC\Memcache\Redis',
+  'redis' => array(
+    'host' => 'redis',
+    'port' => 6379,
+  ),
+);