Victoria: Add libvirt exporter image

docker/prometheus/prometheus-libvirt-exporter/Dockerfile.j2

@@ -0,0 +1,45 @@
+FROM {{ namespace }}/{{ infra_image_prefix }}prometheus-base:{{ tag }}
+{% block labels %}
+LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build_date }}"
+{% endblock %}
+
+{% import "macros.j2" as macros with context %}
+
+{% block prometheus_libvirt_exporter_header %}{% endblock %}
+
+{% if base_distro in ['centos'] %}
+    {% set prometheus_libvirt_exporter_packages = [
+        'go',
+        'libvirt-devel',
+        'git',
+    ] %}
+{% elif base_distro in ['debian', 'ubuntu'] %}
+    {% set prometheus_libvirt_exporter_packages = [
+        'golang-go',
+        'libvirt-dev',
+        'git',
+    ] %}
+{% endif %}
+
+{{ macros.install_packages(prometheus_libvirt_exporter_packages | customizable("packages")) }}
+
+{% block prometheus_libvirt_exporter_version %}
+ARG prometheus_libvirt_exporter_version=2.1.1
+ARG prometheus_libvirt_exporter_url=https://github.com/AlexZzz/libvirt-exporter/archive/refs/tags
+{% endblock %}
+
+{% block prometheus_libvirt_exporter_install %}
+ENV GOPATH=/build
+RUN mkdir /build \
+    && cd /build \
+    && curl -sSL -o libvirt-exporter.tar.gz ${prometheus_libvirt_exporter_url}/${prometheus_libvirt_exporter_version}.tar.gz  \
+    && tar xvf libvirt-exporter.tar.gz \
+    && cd libvirt-exporter-${prometheus_libvirt_exporter_version} \
+    && go build -mod vendor \
+    && install -m 0755 libvirt-exporter /opt/ \
+    && rm -rf /build
+
+{% endblock %}
+
+{% block prometheus_libvirt_exporter_footer %}{% endblock %}
+{% block footer %}{% endblock %}

releasenotes/notes/add-prometheus-libvirt-exporter-8d505dc8b74f8625.yaml

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+---
+features:
+  - Added a container image for Prometheus libvirt exporter, to be used
+    for monitoring deployments which provide VMs with libvirt.