use Cargo.toml & Cargo.lock for sccache build dependency

.github/workflows/build.yml

@@ -104,29 +104,24 @@ jobs:
     name: ${{ matrix.name }}
     steps:
 
-    # sccache's handling of the /fp:fast MSVC compiler option is broken, so use our fork with the fix.
-    # https://github.com/mozilla/sccache/issues/950
+    - name: "Check out repository"
+      uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+
     - name: "[Windows] Set up cargo cache"
       if: runner.os == 'Windows'
       uses: actions/cache@v2
       id: sccache-build-cache
       with:
         path: C:\Users\runneradmin\.cargo
-        # hash of commit to build
-        key: e12434e4db24ccbe52b83fb6e37afcb94fc8d37b
+        key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
 
-    # This needs to be done first because something later messes with $PATH in a way that breaks cargo
+    # This needs to be done early because something later messes with $PATH in a way that breaks cargo
     # by causing it to find link.exe from Git for Windows instead of MSVC.
     - name: "[Windows] Build fixed sccache"
-      shell: bash
       if: runner.os == 'Windows' && steps.sccache-build-cache.outputs.cache-hit != 'true'
-      # TODO: change this to simply `cargo install sccache` after 0.2.16 has been released
-      run: cargo install --git https://github.com/mozilla/sccache.git --branch master
-
-    - name: "Check out repository"
-      uses: actions/checkout@v2
-      with:
-        fetch-depth: 0
+      run: cargo install --path .
 
     - name: "Set up cmake"
       uses: jwlawson/actions-setup-cmake@v1.4

.gitignore

@@ -19,6 +19,8 @@
 src/mixxx.rc.include
 src/mixxx.res
 
+target
+
 *.sqlite
 
 *.cfg

CMakeLists.txt

@@ -2653,6 +2653,7 @@ set(CPACK_STRIP_FILES ON)
 set(CPACK_CREATE_DESKTOP_LINKS "mixxx")
 
 set(CPACK_SOURCE_IGNORE_FILES  "\\\\.#;/#;.*~;\\\\.o$")
+list(APPEND CPACK_SOURCE_IGNORE_FILES "/target/")
 list(APPEND CPACK_SOURCE_IGNORE_FILES "/\\\\.git/")
 list(APPEND CPACK_SOURCE_IGNORE_FILES "/\\\\.github/")
 list(APPEND CPACK_SOURCE_IGNORE_FILES "/cache/")