packaging: Add libdevmapper-dev and GNU target to agent Dockerfile

Install libdevmapper-dev and pkg-config in the agent build container
so devicemapper-sys can link against libdevmapper. Add the GNU libc
rustup target alongside musl since USE_DEVMAPPER forces LIBC=gnu.

Forward USE_DEVMAPPER through build.sh and build-static-agent.sh.
And you can compile the device mapper in kata-agent as below:

```
$ make LIBC=gnu USE_DEVMAPPER=yes
```

Signed-off-by: Alex Lyn <alex.lyn@antgroup.com>

tools/packaging/static-build/agent/Dockerfile

@@ -31,12 +31,14 @@ RUN apt-get update && \
 		g++ \
 		gcc \
 		gnupg \
+		libdevmapper-dev \
 		libprotobuf-dev \
 		libssl-dev \
 		make \
 		musl-tools \
 		openssl \
 		perl \
+		pkg-config \
 		protobuf-compiler && \
 	apt-get clean && rm -rf /var/lib/apt/lists/ && \
 	curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain ${RUST_TOOLCHAIN}
@@ -66,4 +68,7 @@ RUN ARCH=$(uname -m); \
 	        "s390x") rust_arch="${ARCH}"; libc="gnu" ;; \
 	        *) echo "Unsupported architecture: ${ARCH}" && exit 1 ;; \
     	esac; \
-	rustup target add "${rust_arch}-unknown-linux-${libc}"
+	rustup target add "${rust_arch}-unknown-linux-${libc}"; \
+	if [ "${libc}" != "gnu" ]; then \
+		rustup target add "${rust_arch}-unknown-linux-gnu"; \
+	fi

tools/packaging/static-build/agent/build-static-agent.sh

@@ -18,10 +18,11 @@ build_agent_from_source() {
 
 	/usr/bin/install_libseccomp.sh /opt /opt
 
+	# Note: when USE_DEVMAPPER=yes the agent Makefile overrides LIBC=gnu
 	cd src/agent
 	# shellcheck disable=SC2154
-	DESTDIR="${DESTDIR}" AGENT_POLICY="${AGENT_POLICY}" INIT_DATA="${INIT_DATA}" make
-	DESTDIR="${DESTDIR}" AGENT_POLICY="${AGENT_POLICY}" INIT_DATA="${INIT_DATA}" make install
+	DESTDIR="${DESTDIR}" AGENT_POLICY="${AGENT_POLICY}" INIT_DATA="${INIT_DATA}" USE_DEVMAPPER="${USE_DEVMAPPER:-no}" make
+	DESTDIR="${DESTDIR}" AGENT_POLICY="${AGENT_POLICY}" INIT_DATA="${INIT_DATA}" USE_DEVMAPPER="${USE_DEVMAPPER:-no}" make install
 }
 
 build_agent_from_source "$@"

tools/packaging/static-build/agent/build.sh

@@ -31,6 +31,7 @@ docker run --rm -i -v "${repo_root_dir}:${repo_root_dir}" \
 	--env DESTDIR="${DESTDIR}" \
 	--env AGENT_POLICY="${AGENT_POLICY:-no}" \
 	--env INIT_DATA="${INIT_DATA:-yes}" \
+	--env USE_DEVMAPPER="${USE_DEVMAPPER:-no}" \
 	--env LIBSECCOMP_VERSION="${LIBSECCOMP_VERSION}" \
 	--env LIBSECCOMP_URL="${LIBSECCOMP_URL}" \
 	--env GPERF_VERSION="${GPERF_VERSION}" \