.github: clean up unused containers and images before starting

Error: error creating container storage: the container name "infamy0" is already in use by "2011c2d7cb1737b788b854a8bd08e519f3cbd6e36dae4975784978cff1f238fc". You have to remove that container to be able to reuse that name.: that name is already in use
make[1]: *** [/home/github-runner/actions-runner/_work/infix/infix/test/test.mk:6: test-unit] Error 125

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

.github/workflows/regression.yml

@@ -22,6 +22,9 @@ jobs:
       - uses: actions/checkout@v4
         with:
           submodules: 'true'
+      - name: Clean up cruft ...
+        run: |
+          ./test/env -c
       - name: Set Build Variables
         id: vars
         run: |

test/env

@@ -15,6 +15,10 @@ usage: test/env [<OPTS>]    -f <IMAGE> -q <QENETH-DIR> <COMMAND> [<ARGS>...]
 
   Options:
 
+    -c
+     Clean up cruft, lingering images, old containers, unused volumes.
+     Used by GitHub action to prevent issues with runnign tests.
+
     -C
       Don't containerize the command, run it directly in the current
       namespaces
@@ -104,8 +108,14 @@ name()
 containerize=yes
 [ -c /dev/kvm ] && kvm="--device=/dev/kvm"
 
-while getopts "Cf:hiKp:q:t:" opt; do
+while getopts "cCf:hiKp:q:t:" opt; do
     case ${opt} in
+	c)
+	    $(runner) image prune -af
+            $(runner) volume prune -f
+            $(runner) container prune -f
+	    exit 0
+	    ;;
 	C)
 	    containerize=
 	    ;;