ci: skip few ci when pr labled skip-ci

skip build, codegen and unit test ci test when
skip-ci labled is marked in PR.

Closes: https://github.com/rook/rook/issues/9972
Signed-off-by: subhamkrai <srai@redhat.com>

.github/workflows/build.yml

@@ -10,6 +10,7 @@ defaults:
 jobs:
   macos-build:
     runs-on: macos-10.15
+    if: "!contains(github.event.pull_request.labels.*.name, 'skip-ci')"
     steps:
     - name: checkout
       uses: actions/checkout@v2
@@ -69,6 +70,7 @@ jobs:
 
   linux-build-all:
     runs-on: ubuntu-18.04
+    if: "!contains(github.event.pull_request.labels.*.name, 'skip-ci')"
     strategy:
       fail-fast: false
       matrix:

.github/workflows/codegen.yml

@@ -19,6 +19,7 @@ defaults:
 jobs:
   codegen:
     runs-on: ubuntu-18.04
+    if: "!contains(github.event.pull_request.labels.*.name, 'skip-ci')"
     steps:
     - uses: actions/setup-go@v2
       with:

.github/workflows/unit-test.yml

@@ -19,6 +19,7 @@ defaults:
 jobs:
   unittests:
     runs-on: ubuntu-18.04
+    if: "!contains(github.event.pull_request.labels.*.name, 'skip-ci')"
     steps:
     - name: checkout
       uses: actions/checkout@v2