Optimize CI caching

Drop sccache for C/C++, the cache gets overloaded a lot
Stop caching OpenCV distribution files

Author: twistedfall

.github/workflows/opencv-rust.yml

@@ -40,16 +40,10 @@ jobs:
       OPENCV_LINKAGE: ${{ matrix.linkage }}
       SCCACHE_GHA_ENABLED: "true"
       RUSTC_WRAPPER: "sccache"
-      CMAKE_C_COMPILER_LAUNCHER: "sccache"
-      CMAKE_CXX_COMPILER_LAUNCHER: "sccache"
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
       - uses: mozilla-actions/sccache-action@v0.0.7
-      - uses: actions/cache@v4
-        with:
-          path: ~/dist
-          key: dist-${{ matrix.opencv-version }}
 
       - uses: actions/cache@v4
         with:
@@ -153,17 +147,10 @@ jobs:
       OPENCV_VERSION: 4.11.0
       SCCACHE_GHA_ENABLED: "true"
       RUSTC_WRAPPER: "sccache"
-      CMAKE_C_COMPILER_LAUNCHER: "sccache"
-      CMAKE_CXX_COMPILER_LAUNCHER: "sccache"
     steps:
       - uses: actions/checkout@v4
       - uses: mozilla-actions/sccache-action@v0.0.7
 
-      - uses: actions/cache@v4
-        with:
-          path: ~/dist
-          key: dist-${{ env.OPENCV_VERSION }}
-
       - uses: actions/cache@v4
         with:
           path: ~/build

ci/install.sh

@@ -22,13 +22,6 @@ if [[ "$os_family" == "Linux" ]]; then
 	if [[ "${VCPKG_VERSION:-}" != "" ]]; then # vcpkg build
 		"$ci_dir/install-ubuntu-vcpkg.sh"
 	else
-		# workaround for mozilla/sccache action problem /bin/sh: 1: sccache: not found when running `sudo make install`
-		if [[ "${CMAKE_C_COMPILER_LAUNCHER:-}" == "sccache" ]]; then
-			export CMAKE_C_COMPILER_LAUNCHER="$(which sccache)"
-		fi
-		if [[ "${CMAKE_CXX_COMPILER_LAUNCHER:-}" == "sccache" ]]; then
-			export CMAKE_CXX_COMPILER_LAUNCHER="$(which sccache)"
-		fi
 		"$ci_dir/install-ubuntu.sh"
 	fi
 elif [[ "$os_family" == "macOS" ]]; then