test: add git to docker container

Intended to be used when fetching version information for the test
report.

Signed-off-by: Richard Alpe <richard@bit42.se>

test/.env

@@ -2,7 +2,7 @@
 # shellcheck disable=SC2034,SC2154
 
 # Current container image
-INFIX_TEST=ghcr.io/kernelkit/infix-test:2.1
+INFIX_TEST=ghcr.io/kernelkit/infix-test:2.2
 
 ixdir=$(readlink -f "$testdir/..")
 logdir=$(readlink -f "$testdir/.log")

test/docker/Dockerfile

@@ -5,6 +5,7 @@ RUN apk add --no-cache \
     e2fsprogs \
     fakeroot \
     gcc \
+    git \
     graphviz \
     iproute2 \
     iputils \