Migrate kiwix-serve container from Dockerfile to native Dagger build

Replaces the hand-written Dockerfile with container.py using the shared
alpine_runtime helper, which bumps the base image from Alpine 3.22 to 3.23.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

containers/kiwix-serve/Dockerfile

@@ -1,55 +0,0 @@
-# kiwix-serve container
-# Downloads pre-built binary from kiwix mirror
-
-ARG CONTAINER_APP_VERSION=3.8.2
-
-FROM alpine:3.22
-
-ARG TARGETPLATFORM
-ARG CONTAINER_APP_VERSION
-ARG KIWIX_VERSION=${CONTAINER_APP_VERSION}
-
-RUN set -e && \
-    apk --no-cache add dumb-init curl && \
-    # Detect architecture - use TARGETPLATFORM if set, otherwise detect from uname
-    if [ -n "$TARGETPLATFORM" ]; then \
-        echo "TARGETPLATFORM: $TARGETPLATFORM"; \
-        case "$TARGETPLATFORM" in \
-            linux/arm64*) ARCH="aarch64" ;; \
-            linux/amd64*) ARCH="x86_64" ;; \
-            *) ARCH="" ;; \
-        esac; \
-    else \
-        echo "TARGETPLATFORM not set, detecting from uname..."; \
-        UNAME_ARCH=$(uname -m); \
-        echo "uname -m: $UNAME_ARCH"; \
-        case "$UNAME_ARCH" in \
-            aarch64|arm64) ARCH="aarch64" ;; \
-            x86_64) ARCH="x86_64" ;; \
-            *) ARCH="" ;; \
-        esac; \
-    fi && \
-    if [ -z "$ARCH" ]; then \
-        echo "ERROR: Unsupported architecture"; \
-        exit 1; \
-    fi && \
-    url="http://mirror.download.kiwix.org/release/kiwix-tools/kiwix-tools_linux-$ARCH-$KIWIX_VERSION.tar.gz" && \
-    echo "URL: $url" && \
-    curl -k -L $url | tar -xz -C /usr/local/bin/ --strip-components 1 && \
-    apk del curl
-
-ARG CONTAINER_APP_VERSION
-LABEL org.opencontainers.image.title="kiwix-serve"
-LABEL org.opencontainers.image.description="Kiwix content server for offline ZIM files"
-LABEL org.opencontainers.image.version="${CONTAINER_APP_VERSION}"
-LABEL org.opencontainers.image.source="https://forge.eblu.me/eblume/blumeops"
-LABEL org.opencontainers.image.vendor="blumeops"
-
-EXPOSE 80
-
-# Run as non-root
-RUN adduser -D -u 1000 kiwix
-USER kiwix
-
-ENTRYPOINT ["/usr/bin/dumb-init", "--"]
-CMD ["/bin/sh", "-c", "echo 'Use: kiwix-serve [options] <zim-files>' && kiwix-serve --help"]

containers/kiwix-serve/container.py

@@ -0,0 +1,53 @@
+"""Kiwix content server — native Dagger build.
+
+Downloads pre-built kiwix-tools binary from the Kiwix mirror.
+Multi-arch support (aarch64, x86_64) via platform detection.
+"""
+
+import dagger
+
+from blumeops.containers import alpine_runtime, oci_labels
+
+VERSION = "3.8.2"
+
+MIRROR = "http://mirror.download.kiwix.org/release/kiwix-tools"
+
+
+async def build(src: dagger.Directory) -> dagger.Container:
+    runtime = alpine_runtime(
+        extra_apk=["dumb-init", "curl"],
+        uid=1000,
+        gid=1000,
+        username="kiwix",
+    )
+
+    # Download and install the pre-built binary for the target platform
+    runtime = runtime.with_exec(
+        [
+            "sh",
+            "-c",
+            f"ARCH=$(uname -m) && "
+            f'case "$ARCH" in aarch64|arm64) ARCH=aarch64;; x86_64) ARCH=x86_64;; *) echo "Unsupported: $ARCH"; exit 1;; esac && '
+            f'curl -fsSL "{MIRROR}/kiwix-tools_linux-$ARCH-{VERSION}.tar.gz" | tar -xz -C /usr/local/bin/ --strip-components 1',
+        ]
+    ).with_exec(["apk", "del", "curl"])
+
+    runtime = oci_labels(
+        runtime,
+        title="kiwix-serve",
+        description="Kiwix content server for offline ZIM files",
+        version=VERSION,
+    )
+
+    return (
+        runtime.with_exposed_port(80)
+        .with_user("1000")
+        .with_entrypoint(["/usr/bin/dumb-init", "--"])
+        .with_default_args(
+            args=[
+                "/bin/sh",
+                "-c",
+                "echo 'Use: kiwix-serve [options] <zim-files>' && kiwix-serve --help",
+            ]
+        )
+    )