ci: build crosstool (and cmake) as first step

To reduce duplicated effort, build crosstool (and cmake) in one step.
Than download the crosstool artifact when we build all the actual
toolchains so we can save some time not having to build crosstool
for every toolchain build.

Signed-off-by: Kumar Gala <[email protected]>

Author: galak

.buildkite/pipeline-template.yml

@@ -1,6 +1,24 @@
 steps:
+  - label: "$OS-$MACHINE-crosstool-cmake"
+    key: "$OS-$MACHINE-crosstool-cmake"
+    command:
+    - ./go.sh cmake
+    - buildkite-agent artifact upload cmake.$OS.$MACHINE.tar.bz2
+    - ./go.sh crosstool
+    - buildkite-agent artifact upload crosstool.$OS.$MACHINE.tar.bz2
+    env:
+      BUILDKITE_CLEAN_CHECKOUT: "true"
+    plugins:
+      - docker#v3.5.0:
+          image: "zephyrprojectrtos/sdk-build:v1.0.1"
+          propagate-environment: true
+          user: buildkite-agent
+    agents:
+    - "queue=sdk-ng-$MACHINE"
+
   - label: "$OS-$MACHINE"
     key: "$OS-$MACHINE"
+    depends_on: "$OS-$MACHINE-crosstool-cmake"
     command:
     - >
       case "$${BUILDKITE_PARALLEL_JOB}" in
@@ -20,15 +38,14 @@ steps:
          13) TARGET="xtensa_nxp_imx8m_adsp";;
          14) TARGET="xtensa_intel_s1000";;
          15) TARGET="mips";;
-         16) TARGET="cmake";;
-         17) TARGET="arc64";;
+         16) TARGET="arc64";;
       esac
+    - buildkite-agent artifact download crosstool.$OS.$MACHINE.tar.bz2 .
+    - tar xvf crosstool.$OS.$MACHINE.tar.bz2
     - ./go.sh $${TARGET}
     - >
       if [ $${TARGET} = "tools" ]; then
          buildkite-agent artifact upload zephyr-sdk-$MACHINE-hosttools-standalone-0.9.sh;
-      elif [ $${TARGET} = "cmake" ]; then
-         buildkite-agent artifact upload cmake.$OS.$MACHINE.tar.bz2;
       else
          cd build/output
          case "$${TARGET}" in
@@ -44,7 +61,7 @@ steps:
          cd ../..
          buildkite-agent artifact upload $${TARGET}.$OS.$MACHINE.tar.bz2;
       fi
-    parallelism: 18
+    parallelism: 17
     env:
       BUILDKITE_CLEAN_CHECKOUT: "true"
     retry: