CI: drop initramfs-test job (#1854)

Drop ci/initramfs-test.yml job and pickup all the initramfs from the
world build, which is the first job to be executed.
Given that all the initramfs images can be made in the world job,
the initramfs-test become redundant

Author: lumag

.github/actions/compile/action.yml

@@ -86,12 +86,6 @@ runs:
         mv $KAS_WORK_DIR/build/buildchart.svg .
 
         if [ "${INPUTS_MACHINE}" = "qcom-armv8a" ]; then
-          $KAS_CONTAINER build ${KAS_YAMLS}:ci/initramfs-test.yml
-          $KAS_CONTAINER shell ${KAS_YAMLS}:ci/initramfs-test.yml \
-            -c "buildstats-summary --sort duration --highlight 0 --shortest 300"
-          ci/kas-container-shell-helper.sh ci/yocto-pybootchartgui.sh
-          mv $KAS_WORK_DIR/build/buildchart.svg buildchart-initramfs-test.svg
-
           # SDK only with the default kernel
           if [ "${INPUTS_SDK}" = "1" ] && [ "${INPUTS_KERNEL_YAML}" = "" ] ; then
             $KAS_CONTAINER build ${KAS_YAMLS} --task populate_sdk

ci/ci.yml

@@ -9,3 +9,4 @@ local_conf_header:
   ci: |
     BB_SIGNATURE_HANDLER = "OEBasicHash"
     INHERIT:remove = "rm_work"
+    FIRMWARE_COMPRESSION:qcom-armv8a = "zst"