ci: Fix FIH Docker image release usage

The scripts for fih tests install and run where running different
versions of the docker images, since the install specified a version and
not version was specified for run, defaulting to `latest`.

This commits adds a new file for specifying the docker image to be used.

Signed-off-by: Fabio Utzig <utzig@apache.org>
diff --git a/ci/fih-tests_run.sh b/ci/fih-tests_run.sh
index 0237306..c65d218 100755
--- a/ci/fih-tests_run.sh
+++ b/ci/fih-tests_run.sh
@@ -16,6 +16,8 @@
 
 set -e
 
+source $(dirname "$0")/fih-tests_version.sh
+
 pushd .. &&\
    git clone https://git.trustedfirmware.org/TF-M/trusted-firmware-m.git &&\
    pushd trusted-firmware-m &&\
@@ -45,7 +47,7 @@
 fi
 
 if test -z "$FIH_LEVEL"; then
-    docker run --rm -v $(pwd):/root/work/tfm:rw,z mcuboot/fih-test /bin/sh -c '/root/work/tfm/mcuboot/ci/fih_test_docker/execute_test.sh $0 $1 $2' $SKIP_SIZE $BUILD_TYPE $DAMAGE_TYPE
+    docker run --rm -v $(pwd):/root/work/tfm:rw,z mcuboot/fih-test:$FIH_IMAGE_VERSION /bin/sh -c '/root/work/tfm/mcuboot/ci/fih_test_docker/execute_test.sh $0 $1 $2' $SKIP_SIZE $BUILD_TYPE $DAMAGE_TYPE
 else
-    docker run --rm -v $(pwd):/root/work/tfm:rw,z mcuboot/fih-test /bin/sh -c '/root/work/tfm/mcuboot/ci/fih_test_docker/execute_test.sh $0 $1 $2 $3' $SKIP_SIZE $BUILD_TYPE $DAMAGE_TYPE $FIH_LEVEL
+    docker run --rm -v $(pwd):/root/work/tfm:rw,z mcuboot/fih-test:$FIH_IMAGE_VERSION /bin/sh -c '/root/work/tfm/mcuboot/ci/fih_test_docker/execute_test.sh $0 $1 $2 $3' $SKIP_SIZE $BUILD_TYPE $DAMAGE_TYPE $FIH_LEVEL
 fi