Added Caracal container

I have added a new container to the container stack. This contains the Caracal software and Singularity 3.8.1.

caracal_singularity_container/Dockerfile

+# syntax=docker/dockerfile:1
+
+#Start from python image
+FROM python:3.8.16-slim-bullseye
+
+#Update apt-get and install useful packages: build-essential for caracal, the rest for singularity 
+RUN apt-get update && apt-get -y install build-essential manpages-dev build-essential uuid-dev libgpgme-dev squashfs-tools libseccomp-dev wget pkg-config git cryptsetup-bin xz-utils
+
+#Install Go
+ENV VERSION=1.20.3 OS=linux ARCH=amd64
+RUN wget https://dl.google.com/go/go$VERSION.$OS-$ARCH.tar.gz
+RUN tar -C /usr/local -xzvf go$VERSION.$OS-$ARCH.tar.gz
+RUN rm go$VERSION.$OS-$ARCH.tar.gz
+
+#Setup environment for Go
+ENV GOPATH=${HOME}/go PATH=/usr/local/go/bin:${PATH}:${GOPATH}/bin
+
+#Download singularity
+ENV VERSION=3.8.1
+RUN wget https://github.com/hpcng/singularity/releases/download/v${VERSION}/singularity-${VERSION}.tar.gz
+RUN tar -xzf singularity-${VERSION}.tar.gz
+RUN rm singularity-${VERSION}.tar.gz
+WORKDIR /singularity-${VERSION}
+
+#Install singularity
+RUN ./mconfig --without-suid 
+RUN make -C ./builddir
+RUN make -C ./builddir install
+
+#Install requirements
+RUN pip install -U pip setuptools wheel
+
+#Install caracal
+RUN pip install -U caracal