feat(alpine-s): add alpine-s6 base image

Alpine Linux with s6-overlay (simplified version of linuxserver.io's alpine image)

baseimage/alpine-s6/Dockerfile

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+##########################################################################
+
+# Builder image
+FROM alpine AS builder
+
+WORKDIR /app
+RUN apk add --no-cache dos2unix
+COPY root/ .
+RUN dos2unix *
+
+##########################################################################
+
+# Main image
+FROM alpine
+
+ENV TZ="UTC"
+
+COPY --from=builder /app /
+RUN apk add --no-cache bash s6-overlay shadow tzdata
+RUN groupmod -g 1000 users && \
+	useradd -u 911 -U -d /config -s /bin/ash abc && \
+	usermod -G users abc && \
+	mkdir -p /app /config /defaults && \
+	sed -i -e 's/^root::/root:!:/' /etc/shadow && \
+	rm -rf tmp/*
+
+ENTRYPOINT [ "/init" ]

baseimage/alpine-s6/root/etc/cont-init.d/10-adduser

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+#!/usr/bin/with-contenv bash
+# shellcheck shell=bash
+
+PUID=${PUID:-1000}
+PGID=${PGID:-1000}
+
+groupmod -o -g "$PGID" abc
+usermod -o -u "$PUID" abc
+
+chown abc:abc /app
+chown abc:abc /config
+chown abc:abc /defaults

baseimage/alpine-s6/root/etc/cont-init.d/99-custom-files

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+#!/usr/bin/with-contenv bash
+# shellcheck shell=bash
+
+# Directories
+SCRIPTS_DIR_OLD="/config/custom-cont-init.d"
+SCRIPTS_DIR="/custom-cont-init.d"
+
+SERVICES_DIR_OLD="/config/custom-services.d"
+
+# chown legacy folders if they exist
+if [[ -e "${SCRIPTS_DIR_OLD}" ]]; then
+    chown -R 0:0 "${SCRIPTS_DIR_OLD}"
+fi
+
+# chown legacy folders if they exist
+if [[ -e "${SERVICES_DIR_OLD}" ]]; then
+    chown -R 0:0 "${SERVICES_DIR_OLD}"
+fi
+
+# Make sure custom init directory exists and has files in it
+if [[ -e "${SCRIPTS_DIR}" ]] && [[ -n "$(/bin/ls -A ${SCRIPTS_DIR} 2>/dev/null)" ]]; then
+    echo "[custom-init] Files found, executing"
+    for SCRIPT in "${SCRIPTS_DIR}"/*; do
+        NAME="$(basename "${SCRIPT}")"
+        if [[ -f "${SCRIPT}" ]]; then
+            echo "[custom-init] ${NAME}: executing..."
+            /bin/bash "${SCRIPT}"
+            echo "[custom-init] ${NAME}: exited $?"
+        elif [[ ! -f "${SCRIPT}" ]]; then
+            echo "[custom-init] ${NAME}: is not a file"
+        fi
+    done
+
+    # Remove legacy folder if it's empty
+    if [[ -e "${SCRIPTS_DIR_OLD}" ]] && [[ -z "$(/bin/ls -A ${SCRIPTS_DIR_OLD} 2>/dev/null)" ]]; then
+        echo "[custom-init] Legacy files folder ${SCRIPTS_DIR_OLD} is empty, deleting..."
+        rm -rf "${SCRIPTS_DIR_OLD}"
+    fi 
+elif [[ -e "${SCRIPTS_DIR_OLD}" ]] && [[ -n "$(/bin/ls -A ${SCRIPTS_DIR_OLD} 2>/dev/null)" ]]; then
+    echo "[custom-init] Files found, executing"
+    for SCRIPT in "${SCRIPTS_DIR_OLD}"/*; do
+        NAME="$(basename "${SCRIPT}")"
+        if [[ -f "${SCRIPT}" ]]; then
+            echo "[custom-init] ${NAME}: executing..."
+            /bin/bash "${SCRIPT}"
+            echo "[custom-init] ${NAME}: exited $?"
+        elif [[ ! -f "${SCRIPT}" ]]; then
+            echo "[custom-init] ${NAME}: is not a file"
+        fi
+    done
+elif [[ -e "${SCRIPTS_DIR_OLD}" ]] && [[ -z "$(/bin/ls -A ${SCRIPTS_DIR_OLD} 2>/dev/null)" ]]; then
+    echo "[custom-init] Legacy files folder ${SCRIPTS_DIR_OLD} is empty, deleting..."
+    rm -rf "${SCRIPTS_DIR_OLD}"
+else
+    echo "[custom-init] No custom files found, skipping..."
+fi