btrfs-progs: ci: add awk to Tumbleweed image

The CI image build workflow started to fail due to missing 'awk',
install it.

Signed-off-by: David Sterba <[email protected]>

Author: kdave

ci/images/ci-openSUSE-tumbleweed-x86_64/Dockerfile

@@ -6,7 +6,7 @@ RUN zypper install -y --no-recommends make gcc tar gzip clang dwarves
 RUN zypper install -y --no-recommends libattr-devel libblkid-devel libuuid-devel
 RUN zypper install -y --no-recommends libext2fs-devel
 RUN zypper install -y --no-recommends zlib-devel lzo-devel libzstd-devel
-RUN zypper install -y --no-recommends autoconf automake pkg-config
+RUN zypper install -y --no-recommends autoconf automake pkg-config gawk
 RUN zypper install -y --no-recommends python3 python3-devel python3-setuptools
 RUN zypper install -y --no-recommends libudev-devel