ci: Allow ANGLE_TAG to be unset in -runner scripts

The android-runner scripts use `set -u`, which causes them to fail if
ANGLE_TAG is not defined. This issue went unnoticed because all current
Android jobs set ANGLE_TAG.

Update all -runner scripts to tolerate ANGLE_TAG being unset.

Signed-off-by: Valentine Burley <valentine.burley@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35362>

.gitlab-ci/android-deqp-runner.sh

@@ -42,7 +42,7 @@ if [ -e "$INSTALL/$GPU_VERSION-skips.txt" ]; then
     DEQP_SKIPS="$DEQP_SKIPS /data/deqp/$GPU_VERSION-skips.txt"
 fi
 
-if [ -n "$ANGLE_TAG" ]; then
+if [ -n "${ANGLE_TAG:-}" ]; then
     DEQP_SKIPS="$DEQP_SKIPS /data/deqp/angle-skips.txt"
 fi
 

.gitlab-ci/android-runner.sh

@@ -114,7 +114,7 @@ GLES_RUNTIME_VERSION="$(get_gles_runtime_version)"
 get_vk_runtime_device_name
 VK_RUNTIME_VERSION="$(get_vk_runtime_version)"
 
-if [ -n "$ANGLE_TAG" ]; then
+if [ -n "${ANGLE_TAG:-}" ]; then
   # Note: we are injecting the ANGLE libs too, so we need to check if the
   #       new ANGLE libs are being used.
   ANGLE_HASH=$(head -c 12 /angle/version)

.gitlab-ci/cuttlefish-runner.sh

@@ -9,7 +9,7 @@ set -uex
 section_start cuttlefish_setup "cuttlefish: setup"
 
 # Structured tagging check for angle
-if [ -n "$ANGLE_TAG" ]; then
+if [ -n "${ANGLE_TAG:-}" ]; then
     # Bail out if the ANGLE_TAG differs from what is offered in the system
     ci_tag_test_time_check "ANGLE_TAG"
 fi

.gitlab-ci/deqp-runner.sh

@@ -25,8 +25,8 @@ ARCH=$(uname -m)
 export VK_DRIVER_FILES="$PWD"/install/share/vulkan/icd.d/"$VK_DRIVER"_icd."$ARCH".json
 export OCL_ICD_VENDORS="$PWD"/install/etc/OpenCL/vendors/
 
-if [ -n "$ANGLE_TAG" ]; then
-  # Are we using the right angle version?
+if [ -n "${ANGLE_TAG:-}" ]; then
+  # Are we using the right ANGLE version?
   ci_tag_test_time_check "ANGLE_TAG"
   export LD_LIBRARY_PATH=/angle:$LD_LIBRARY_PATH
 fi
@@ -79,7 +79,7 @@ if [ -e "$INSTALL/$GPU_VERSION-slow-skips.txt" ] && [[ $CI_JOB_NAME != *full* ]]
     DEQP_SKIPS="$DEQP_SKIPS $INSTALL/$GPU_VERSION-slow-skips.txt"
 fi
 
-if [ -n "$ANGLE_TAG" ]; then
+if [ -n "${ANGLE_TAG:-}" ]; then
     DEQP_SKIPS="$DEQP_SKIPS $INSTALL/angle-skips.txt"
 fi