feat: Adds entrypoint.sh script to docker to allow attaching to a shell inside the container.

docker/Dockerfile

@@ -55,6 +55,8 @@ RUN export DEBIAN_FRONTEND=nointeractive DEBCONF_NOINTERACTIVE_SEEN=true && \
   && rm -r /var/lib/apt/lists/*
 
 COPY --from=build /staging/hpa /usr/local/bin
+COPY docker/entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
 
 # Setup volumes
 RUN mkdir /config && \
@@ -67,5 +69,5 @@ RUN mkdir /config && \
 
 VOLUME /config /consults /playbook /template
 
-ENTRYPOINT [ "/usr/local/bin/hpa" ] 
+ENTRYPOINT [ "/entrypoint.sh" ] 
 CMD ["--help"]

docker/entrypoint.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+# Allows to attach to a shell inside the container, otherwise run the 'hpa' script
+# with the given arguments.
+#
+while [[ $# -gt 0 ]]; do
+	if [[ $1 == "/bin/bash" ]] || [[ $1 == "bash" ]]; then
+		shift
+		/bin/bash "$@"
+		exit $?
+	elif [[ $1 == "/bin/sh" ]] || [[ $1 == "sh" ]]; then
+		shift
+		/bin/sh "$@"
+		exit $?
+	else
+		/usr/local/bin/hpa "$@"
+	fi
+	shift
+done