Added the KiCad 6 docker file with _k6 in the name

Dockerfile_k6

@@ -0,0 +1,20 @@
+FROM setsoft/kicad_auto:dev_k6
+LABEL AUTHOR Salvador E. Tropea <set@ieee.org>
+LABEL Description="export various files from KiCad projects"
+
+RUN     apt-get update  && \
+	apt-get -y install -t bullseye-backports curl && \
+	apt-get -y install make wget && \
+	curl -s https://api.github.com/repos/INTI-CMNB/kicad-git-filters/releases/latest | grep "browser_download_url.*deb" | cut -d : -f 2,3 | tr -d \" | wget -i - && \
+	apt -y install --no-install-recommends ./*.deb && \
+	apt-get -y remove curl wget && \
+	apt-get -y autoremove && \
+	rm /*.deb && \
+	rm -rf /var/lib/apt/lists/*
+
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+
+WORKDIR /mnt
+
+ENTRYPOINT [ "/entrypoint.sh" ]