Fixed #351: docker images for all supported architectures

Copies behavior from kiwix-tools
Requires VERSION=3.2.0-1 or later

docker/Dockerfile

@@ -1,11 +1,34 @@
-ARG VERSION=
-FROM alpine:3
-ARG VERSION
+FROM alpine:3.18
 LABEL org.opencontainers.image.source https://github.com/openzim/zim-tools
-RUN echo "Build image for version: $VERSION"
 
-RUN wget -O - -q https://download.openzim.org/release/zim-tools/zim-tools_linux-x86_64-$VERSION.tar.gz | tar -xz && \
-  cp zim-tools*/* /usr/local/bin/ && \
-  rm -rf zim-tools*
+# TARGETPLATFORM is injected by docker build
+ARG TARGETPLATFORM
+ARG VERSION
+
+RUN set -e && \
+    apk --no-cache add dumb-init curl && \
+    echo "TARGETPLATFORM: $TARGETPLATFORM" && \
+    if [ "$TARGETPLATFORM" = "linux/386" ]; then ARCH="i586"; \
+    # linux/arm64/v8 points to linux/arm64
+    elif [ "$TARGETPLATFORM" = "linux/arm64/v8" \
+        -o "$TARGETPLATFORM" = "linux/arm64" ]; then ARCH="aarch64"; \
+    # linux/arm translates to linux/arm/v7
+    elif [ "$TARGETPLATFORM" = "linux/arm/v7" ]; then ARCH="armv8"; \
+    elif [ "$TARGETPLATFORM" = "linux/arm/v6" ]; then ARCH="armv6"; \
+    elif [ "$TARGETPLATFORM" = "linux/amd64/v3" \
+        -o "$TARGETPLATFORM" = "linux/amd64/v2" \
+        -o "$TARGETPLATFORM" = "linux/amd64" ]; then ARCH="x86_64"; \
+    # we dont suppot any other arch so let it fail
+    else ARCH="unknown"; fi && \
+    # download requested kiwix-tools version
+    url="https://download.openzim.org/release/zim-tools/zim-tools_linux-$ARCH-$VERSION.tar.gz" && \
+    echo "URL: $url" && \
+    curl -k -L $url | tar -xz -C /usr/local/bin/ --strip-components 1 && \
+    # only needed in dockerfile
+    apk del curl
+
+# expose kiwix-serve default port
+EXPOSE 80
 
+ENTRYPOINT ["/usr/bin/dumb-init", "--"]
 CMD ["/bin/sh", "-c", "echo 'Welcome to zim-tools! The following binaries are available:' && ls /usr/local/bin/"]