feat: mysql-bkup v2 on bkupkit

MysQL backup and restore built on the shared bkupkit core:
streaming end to end, with no dump held in memory or written to
local disk.

Dockerfile

@@ -1,47 +1,64 @@
-FROM golang:1.26.0 AS build
+# syntax=docker/dockerfile:1
+ARG GO_IMAGE=golang:1.26.3-trixie
+ARG RUNTIME_IMAGE=debian:13.7-slim
+ARG MYSQL_IMAGE=mysql:8.4.13
+
+FROM --platform=$BUILDPLATFORM ${GO_IMAGE} AS build
 WORKDIR /app
-ARG appVersion=""
-
-# Copy the source code.
-COPY . .
-# Installs Go dependencies
+ARG TARGETOS
+ARG TARGETARCH
+ARG TARGETVARIANT
+ARG appVersion="development"
+COPY go.mod go.sum ./
 RUN go mod download
+COPY . .
+RUN GOARM="${TARGETVARIANT#v}" CGO_ENABLED=0 GOOS=${TARGETOS} GOARCH=${TARGETARCH} \
+    go build -trimpath -ldflags="-s -w -X main.Version=${appVersion}" -o /out/mysql-bkup .
 
-# Build
-RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-X 'github.com/jkaninda/mysql-bkup/utils.Version=${appVersion}'" -o /app/mysql-bkup
+# Oracle MySQL client binaries, per architecture.
+FROM ${MYSQL_IMAGE} AS mysqlclient-amd64
+RUN mkdir -p /out && cp /usr/bin/mysql /usr/bin/mysqldump /out/
+FROM ${MYSQL_IMAGE} AS mysqlclient-arm64
+RUN mkdir -p /out && cp /usr/bin/mysql /usr/bin/mysqldump /out/
+FROM ${RUNTIME_IMAGE} AS mysqlclient-arm
+RUN mkdir -p /out
+FROM mysqlclient-${TARGETARCH} AS mysqlclient
 
-FROM alpine:3.23.3
+FROM ${RUNTIME_IMAGE}
+ARG appVersion="development"
 ENV TZ=UTC
-ARG WORKDIR="/config"
-ARG BACKUPDIR="/backup"
-ARG BACKUP_TMP_DIR="/tmp/backup"
-ARG TEMPLATES_DIR="/config/templates"
-ARG appVersion=""
-ENV VERSION=${appVersion}
-LABEL org.opencontainers.image.title="mysql-bkup"
-LABEL org.opencontainers.image.description="A lightweight MySQL backup and restore tool"
-LABEL org.opencontainers.image.licenses="MIT"
-LABEL org.opencontainers.image.authors="Jonas Kaninda <me@jonaskaninda.com>"
-LABEL org.opencontainers.image.version=${appVersion}
-LABEL org.opencontainers.image.source="https://github.com/jkaninda/mysql-bkup"
+LABEL org.opencontainers.image.title="mysql-bkup" \
+      org.opencontainers.image.description="Back up and restore MySQL and MariaDB databases to local storage, S3, GCS, Azure, SFTP or FTP, with GPG or age encryption" \
+      org.opencontainers.image.licenses="MIT" \
+      org.opencontainers.image.authors="Jonas Kaninda <me@jkaninda.dev>" \
+      org.opencontainers.image.version=${appVersion} \
+      org.opencontainers.image.source="https://github.com/jkaninda/mysql-bkup"
 
-RUN apk --update add --no-cache mysql-client mariadb-connector-c tzdata ca-certificates
-RUN mkdir -p $WORKDIR $BACKUPDIR $TEMPLATES_DIR $BACKUP_TMP_DIR && \
-     chmod a+rw $WORKDIR $BACKUPDIR $BACKUP_TMP_DIR
-COPY --from=build /app/mysql-bkup /usr/local/bin/mysql-bkup
-COPY ./templates/* $TEMPLATES_DIR/
-RUN chmod +x /usr/local/bin/mysql-bkup && \
-    ln -s /usr/local/bin/mysql-bkup /usr/local/bin/bkup
 
-# Create backup script and make it executable
-RUN printf '#!/bin/sh\n/usr/local/bin/mysql-bkup backup "$@"' > /usr/local/bin/backup && \
-    chmod +x /usr/local/bin/backup
-# Create restore script and make it executable
-RUN printf '#!/bin/sh\n/usr/local/bin/mysql-bkup restore "$@"' > /usr/local/bin/restore && \
-    chmod +x /usr/local/bin/restore
-# Create migrate script and make it executable
-RUN printf '#!/bin/sh\n/usr/local/bin/mysql-bkup migrate "$@"' > /usr/local/bin/migrate && \
-    chmod +x /usr/local/bin/migrate
+RUN apt-get update \
+ && apt-get install -y --no-install-recommends \
+      mariadb-client-core libssl3t64 zlib1g libncurses6 libtinfo6 \
+      tini tzdata ca-certificates \
+ && cd /tmp && apt-get download mariadb-client \
+ && dpkg-deb --fsys-tarfile mariadb-client_*.deb | tar -x -C / ./usr/bin/mariadb-dump \
+ && rm -f mariadb-client_*.deb \
+ && rm -rf /var/lib/apt/lists/*
 
-WORKDIR $WORKDIR
-ENTRYPOINT ["/usr/local/bin/mysql-bkup"]
+# /usr/local/bin comes first in PATH: mysql and mysqldump are Oracle's there,
+# while Debian's /usr/bin/mysql* are links to the MariaDB tools.
+COPY --from=mysqlclient /out/ /usr/local/bin/
+COPY --from=build /out/mysql-bkup /usr/local/bin/mysql-bkup
+
+
+RUN mkdir -p /config /backup /tmp/backup \
+ && chmod 1777 /backup /tmp/backup \
+ && ln -s /usr/local/bin/mysql-bkup /usr/local/bin/bkup \
+ && printf '#!/bin/sh\nexec /usr/local/bin/mysql-bkup backup "$@"\n' > /usr/local/bin/backup \
+ && printf '#!/bin/sh\nexec /usr/local/bin/mysql-bkup restore "$@"\n' > /usr/local/bin/restore \
+ && printf '#!/bin/sh\nexec /usr/local/bin/mysql-bkup migrate "$@"\n' > /usr/local/bin/migrate \
+ && chmod +x /usr/local/bin/backup /usr/local/bin/restore /usr/local/bin/migrate \
+ && (mysqldump --version 2>/dev/null || true) && mariadb-dump --version && mysql-bkup version
+
+WORKDIR /config
+HEALTHCHECK --interval=1m --timeout=10s --start-period=1m CMD ["/usr/local/bin/mysql-bkup", "health"]
+ENTRYPOINT ["/usr/bin/tini", "--", "/usr/local/bin/mysql-bkup"]