Add a Bazel Buildifier CI job

.github/workflows/ci.yml

@@ -153,3 +153,13 @@ jobs:
             -lpthread $(pkg-config --cflags --libs libsodium opus vpx)
       - name: Run the test
         run: "./send_message_test | grep 'tox clients connected'"
+
+  buildifier:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Check
+        run: |
+          wget --no-verbose --output-document=buildifier https://github.com/bazelbuild/buildtools/releases/download/4.2.5/buildifier-linux-amd64
+          sudo chmod +x buildifier
+          ./buildifier --lint=warn --warnings=all -mode diff $(find . -type f -name BUILD.bazel)

auto_tests/BUILD.bazel

@@ -16,9 +16,9 @@ cc_library(
     deps = [
         ":check_compat",
         "//c-toxcore/testing:misc_tools",
+        "//c-toxcore/toxcore",
         "//c-toxcore/toxcore:Messenger",
         "//c-toxcore/toxcore:mono_time",
-        "//c-toxcore/toxcore",
     ],
 )
 
@@ -40,8 +40,8 @@ flaky_tests = {
         False,
     ),
     deps = [
-        ":check_compat",
         ":auto_test_support",
+        ":check_compat",
         "//c-toxcore/testing:misc_tools",
         "//c-toxcore/toxav",
         "//c-toxcore/toxcore",

other/fun/BUILD.bazel

@@ -28,7 +28,10 @@ cc_binary(
 cc_binary(
     name = "create_minimal_savedata",
     testonly = 1,
-    srcs = ["create_minimal_savedata.c", "create_common.h"],
+    srcs = [
+        "create_common.h",
+        "create_minimal_savedata.c",
+    ],
     deps = [
         "//c-toxcore/toxcore:ccompat",
         "@libsodium",
@@ -38,7 +41,10 @@ cc_binary(
 cc_binary(
     name = "create_savedata",
     testonly = 1,
-    srcs = ["create_savedata.c", "create_common.h"],
+    srcs = [
+        "create_common.h",
+        "create_savedata.c",
+    ],
     deps = [
         "//c-toxcore/toxcore",
         "//c-toxcore/toxcore:ccompat",
@@ -49,7 +55,10 @@ cc_binary(
 cc_binary(
     name = "create_bootstrap_keys",
     testonly = 1,
-    srcs = ["create_bootstrap_keys.c", "create_common.h"],
+    srcs = [
+        "create_bootstrap_keys.c",
+        "create_common.h",
+    ],
     deps = [
         "//c-toxcore/toxcore:ccompat",
         "@libsodium",