[gjs: 1/2] CI: clear the static analysis image a bit more

[Philip Chimento <pchimento src gnome org>]

commit eeaf906b0028bd67aa877357574ba6287da50915
Author: Claudio André <claudioandre br gmail com>
Date:   Sat Jul 21 21:36:49 2018 -0300

    CI: clear the static analysis image a bit more
    
    [skip ci]

 test/extra/Dockerfile.fedora.static-analysis | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/test/extra/Dockerfile.fedora.static-analysis b/test/extra/Dockerfile.fedora.static-analysis
index 15a03eda..70f62115 100644
--- a/test/extra/Dockerfile.fedora.static-analysis
+++ b/test/extra/Dockerfile.fedora.static-analysis
@@ -11,7 +11,8 @@ RUN dnf -y --nogpgcheck upgrade && \
     mkdir -p /cwd && \
     pip install cpplint && \
     npm install -g eslint && \
-    dnf -y clean all
+    dnf -y clean all && \
+    rm -rf /var/cache/dnf
 
 CMD ["/bin/bash"]