Use sccache to accelerate android build (#9587)

Android didn't use sccache because it has its own NDK clang. Now use env
var to trigger clang from sccache.

Author: kirklandsign

.github/workflows/_android.yml

@@ -22,6 +22,10 @@ jobs:
       script: |
         set -eux
 
+        # Use sccache for NDK compiler as well
+        export CMAKE_CXX_COMPILER_LAUNCHER=sccache
+        export CMAKE_C_COMPILER_LAUNCHER=sccache
+
         # The generic Linux job chooses to use base env, not the one setup by the image
         CONDA_ENV=$(conda env list --json | jq -r ".envs | .[-1]")
         conda activate "${CONDA_ENV}"

.github/workflows/android-perf.yml

@@ -353,6 +353,10 @@ jobs:
       script: |
         set -eux
 
+        # Use sccache for NDK compiler as well
+        export CMAKE_CXX_COMPILER_LAUNCHER=sccache
+        export CMAKE_C_COMPILER_LAUNCHER=sccache
+
         # The generic Linux job chooses to use base env, not the one setup by the image
         CONDA_ENV=$(conda env list --json | jq -r ".envs | .[-1]")
         conda activate "${CONDA_ENV}"

.github/workflows/android-release-artifacts.yml

@@ -60,6 +60,10 @@ jobs:
       script: |
         set -eux
 
+        # Use sccache for NDK compiler as well
+        export CMAKE_CXX_COMPILER_LAUNCHER=sccache
+        export CMAKE_C_COMPILER_LAUNCHER=sccache
+
         # The generic Linux job chooses to use base env, not the one setup by the image
         CONDA_ENV=$(conda env list --json | jq -r ".envs | .[-1]")
         conda activate "${CONDA_ENV}"