container: Add container image build script

.containerignore

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+*
+!src/
+!Cargo.lock
+!Cargo.toml

Containerfile

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+FROM registry.fedoraproject.org/fedora AS build
+
+RUN --mount=type=cache,target=/var/cache \
+	dnf5 install -y \
+		--setopt persistdir=/var/cache/dnf \
+		--setopt install_weak_deps=0 \
+		cargo \
+		openssl-devel \
+		paho-c-devel \
+	&& :
+
+WORKDIR /src
+
+COPY . .
+
+RUN cargo build --release && strip target/release/mqtt2vl
+
+
+FROM git.pyrocufflink.net/containerimages/dch-base
+
+RUN --mount=type=cache,target=/var/cache \
+	dnf5 install -y \
+		--setopt persistdir=/var/cache/dnf \
+		--setopt install_weak_deps=0 \
+		paho-c \
+	&& :
+
+COPY --from=build /src/target/release/mqtt2vl /usr/local/bin/mqtt2vl
+
+ENTRYPOINT ["mqtt2vl"]