new: enter fully setup compose image for debug

With ``ENTER=1``, one can enter the fully configured
container instead of launching compose.

Signed-off-by: Valentin Lab <valentin.lab@kalysto.org>

bin/compose

@@ -665,12 +665,23 @@ run() {
         debug "${WHITE}Launching:${NORMAL}"
         echo "docker run --rm \\"
         pretty_print "${docker_run_opts[@]}" | sed -r 's/^/    /g;s/([^\])$/\1\\\n/g'
-        echo "    ${COMPOSE_DOCKER_IMAGE} \\"
-        echo "       " "$@"
+        if [ -z "$ENTER" ]; then
+            echo "    ${COMPOSE_DOCKER_IMAGE} \\"
+            echo "       " "$@"
+        else
+            echo "    --entrypoint bash \\"
+            echo "    ${COMPOSE_DOCKER_IMAGE}"
+        fi
     fi | { if [ -n "$DEBUG" ]; then sed -r 's/^/  /g'; else cat; fi } >&2
     if [ -z "$DRY_RUN" ]; then
         debug "${WHITE}Execution:${NORMAL}"
-        exec docker run --rm "${docker_run_opts[@]}" "${COMPOSE_DOCKER_IMAGE}" "$@"
+        if [ -z "$ENTER" ]; then
+            exec docker run --rm "${docker_run_opts[@]}" "${COMPOSE_DOCKER_IMAGE}" "$@"
+        else
+            exec docker run --rm "${docker_run_opts[@]}" \
+                 --entrypoint bash \
+                 "${COMPOSE_DOCKER_IMAGE}"
+        fi
     fi
 }