Add radicale

radicale.Dockerfile

@@ -0,0 +1,18 @@
+# syntax=docker/dockerfile:1
+# gentoo-radicale
+FROM registry.ceamac.ro/gentoo-base-busybox AS builder
+
+WORKDIR /workdir
+COPY --exclude=repos --exclude=bin . .
+RUN --mount=type=cache,target=/workdir/cache,sharing=locked <<-EOF
+	/bin/bash src/setup-radicale.sh /mnt/gentoo -j8
+EOF
+
+FROM scratch
+WORKDIR /
+EXPOSE 5232
+VOLUME ["/etc/radicale", "/var/lib/radicale"]
+COPY --from=builder /mnt/gentoo /
+RUN tar c -j -f /var/db/pkg.tar.bz2 -C /var/db/pkg . && rm -fR /var/db/pkg
+USER radicale:radicale
+CMD ["/usr/bin/radicale"]