Added ftpd image

Simple pure-ftpd image meant for anonymous read-only downloads

.github/workflows/ftpd_ci.yml

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+name: ftpd
+
+on:
+  push:
+    branches:
+      - 'main'
+    paths:
+      - 'ftpd/**'
+  workflow_dispatch:
+
+jobs:
+
+  ftpd:
+    name: Deploy ftpd Image
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+      - name: Publish Docker Image
+        uses: openzim/docker-publish-action@v10
+        with:
+          image-name: kiwix/ftpd
+          on-master: latest
+          restrict-to: kiwix/container-images
+          context: ftpd
+          registries: ghcr.io
+          credentials:
+            GHCRIO_USERNAME=${{ secrets.GHCR_USERNAME }}
+            GHCRIO_TOKEN=${{ secrets.GHCR_TOKEN }}

ftpd/Dockerfile

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+FROM alpine:3.21
+LABEL org.opencontainers.image.source=https://github.com/kiwix/container-images
+
+RUN \
+    apk add --no-cache \
+        dumb-init \
+        pure-ftpd \
+    # must exists as it is root of data (should be mounted usually)
+    && mkdir -p /var/lib/ftp \
+    && printf "\
+MaxClientsNumber             25\n\
+Daemonize                    no\n\
+VerboseLog                   yes\n\
+AnonymousOnly                yes\n\
+AllowAnonymousFXP            yes\n\
+AnonymousCantUpload          yes\n\
+" >> /etc/pure-ftpd.conf
+
+VOLUME /var/lib/ftp
+EXPOSE 21
+
+ENTRYPOINT ["/usr/bin/dumb-init", "--"]
+CMD ["/usr/sbin/pure-ftpd"]

ftpd/README.md

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+# ftpd
+
+Simple pure-ftpd image pre-configured for Anonymous downloads.
+
+Tweak the command for runtime-specific options.
+
+Example:
+
+```yaml
+command: ["/usr/sbin/pure-ftpd", "-4", "-p", "2000:2050", "-S", "0.0.0.0,21", "-P", "master.download.kiwix.org"]
+```