Add dotnet 6.0 image

Makefile

@@ -29,7 +29,7 @@ php-unit-test: php-unit-test_5.6 php-unit-test_7.0 php-unit-test_7.1 php-unit-te
 mobile: android-build-server
 static-code-analysis: static-code-analysis_latest static-code-analysys_php static-code-analysys_python static-code-analysys_android
 utility: alpine-ssh-client merge-request-check
-dotnet: dotnet_3.1 dotnet_5.0
+dotnet: dotnet_3.1 dotnet_5.0 dotnet_6.0
 
 # PHP Lint Images
 ####################
@@ -147,6 +147,8 @@ dotnet_3.1: dotnet-build-server/3.1/Dockerfile
 dotnet_5.0: dotnet-build-server/5.0/Dockerfile
 	docker build $(BUILD_ARGS) -t ${REPO_ORG}/dotnet-build-server:5.0 -f dotnet-build-server/5.0/Dockerfile dotnet-build-server/5.0/
 
+dotnet_6.0: dotnet-build-server/6.0/Dockerfile
+	docker build $(BUILD_ARGS) -t ${REPO_ORG}/dotnet-build-server:6.0 -f dotnet-build-server/6.0/Dockerfile dotnet-build-server/6.0/
 
 #IMAGES_TO_SCAN = $(shell docker images --format '{{.Repository}}:{{.Tag}}' | grep unl-its )
 #security:

dotnet-build-server/6.0/Dockerfile

+FROM mcr.microsoft.com/dotnet/sdk:6.0
+
+ARG BUILD_DATE
+ARG VCS_REF
+ARG VERSION
+LABEL org.label-schema.build-date=$BUILD_DATE \
+      org.label-schema.name="dotnet SDK 6.0" \
+      org.label-schema.description="Docker image to build .NET core 6.0 applications" \
+      org.label-schema.vcs-ref=$VCS_REF \
+      org.label-schema.vendor="University of Nebraska - Lincoln" \
+      org.label-schema.version="0.1.2" \
+      org.label-schema.schema-version="1.0" \
+      maintainer="Roger Feese <rfeese@nebraska.edu>"
+
+# Make sure that tools we need are installed
+# Add external nodejs LTS apt source
+RUN curl -fsSL https://deb.nodesource.com/setup_14.x | bash -
+# Create missing man directores for update-alternatives
+RUN mkdir -p /usr/share/man/man1
+# JRE, NodeJS for sonarqube scanner post-scan
+RUN apt-get update && apt-get install -y \
+    git \
+    openjdk-11-jre \
+    nodejs \
+    && rm -rf /var/lib/apt/lists/*
+
+# sonarscanner (https://docs.sonarqube.org/latest/analysis/scan/sonarscanner-for-msbuild/)
+RUN dotnet tool install --global dotnet-sonarscanner
+RUN dotnet tool install --global trx2junit
+ENV PATH=/root/.dotnet/tools:$PATH