add version check

Author: bachue

.github/workflows/version-check.yml

@@ -0,0 +1,18 @@
+name: C SDK Version Check
+on:
+  push:
+    tags:
+        - 'v[0-9]+.[0-9]+.[0-9]+'
+jobs:
+  linux:
+    name: Version Check
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Set env
+        run: echo "RELEASE_VERSION=${GITHUB_REF#refs/*/v}" >> $GITHUB_ENV
+      - name: Check
+        run: |
+          set -e
+          grep -qF "const char *version = \"${RELEASE_VERSION}\";" qiniu/conf.c