Install Sonobuoy in Dockerfile

Add Sonobuoy installation to Dockerfile with multi-architecture support.

Signed-off-by: gerbsen <1186245+gerbsen@users.noreply.github.com>

Use default build variables from docker

Author: gerbsen

Tests/Dockerfile

@@ -4,6 +4,15 @@ FROM python:3.10
 
 WORKDIR /scs-compliance
 
+ARG SONOBUOY_VERSION=0.57.3
+ARG TARGETOS
+ARG TARGETARCH
+
+RUN set -eux; \
+    wget -qO- https://github.com/vmware-tanzu/sonobuoy/releases/download/v$SONOBUOY_VERSION/sonobuoy_${SONOBUOY_VERSION}_${TARGETOS}_${TARGETARCH}.tar.gz \
+      | tar -xz -C /usr/local/bin; \
+    chmod +x /usr/local/bin/sonobuoy
+
 COPY requirements.txt requirements.txt
 COPY iaas/requirements.txt iaas-requirements.txt
 COPY kaas/requirements.txt kaas-requirements.txt