server: Add Containerfile

The SSHCA server is intended to be run in a Kubernetes container.

server/.containerignore

@@ -0,0 +1,5 @@
+*
+!src/
+!examples/
+!Cargo.toml
+!Cargo.lock

server/Containerfile

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+FROM registry.fedoraproject.org/fedora:38 AS build
+
+RUN --mount=type=cache,target=/var/cache \
+	dnf install -y \
+		--setopt install_weak_deps=0 \
+		cargo \
+		libvirt-devel \
+		rust \
+	&& :
+
+COPY . /build
+
+RUN cd /build && cargo build --release --bins && strip -s target/release/sshca
+
+FROM registry.fedoraproject.org/fedora-minimal:38
+
+RUN --mount=type=cache,target=/var/cache \
+	microdnf install -y \
+		--setopt install_weak_deps=0 \
+		tini \
+		libvirt-libs \
+		openssh-clients \
+	&& :
+
+COPY --from=build /build/target/release/sshca /usr/local/bin/sshca
+
+USER 298:298
+
+ENTRYPOINT ["tini", "/usr/local/bin/sshca", "--"]