ci: add automatic docs-version consistency check against Maven Central

build.yml/build-sample.yml are workflow_dispatch-only (heavy OpenCV build),
so this check needed its own lightweight, auto-triggered workflow. Fails if
README.md's install snippet drifts from the version actually live on Maven
Central.

Author: LucQuebec

.github/workflows/ci.yml

@@ -0,0 +1,32 @@
+name: CI (docs check)
+
+# Lightweight, auto-triggered check — separate from build.yml/build-sample.yml
+# (workflow_dispatch only, since the full OpenCV build is heavy/slow).
+on:
+  push:
+    branches: [main]
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  docs-version-check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Docs version consistency check
+        # Source of truth = what's ACTUALLY live on Maven Central (not gradle.properties'
+        # VERSION, which can be bumped locally without ever being published).
+        run: |
+          V=$(curl -sf "https://repo1.maven.org/maven2/dev/ffmpegkit-maintained/opencv-contrib-android/maven-metadata.xml" \
+            | grep -oP '<release>\K[^<]+')
+          if [ -z "$V" ]; then
+            echo "::error::could not fetch the current release version from Maven Central metadata"
+            exit 1
+          fi
+          echo "Live on Maven Central: $V"
+          if ! grep -q "dev.ffmpegkit-maintained:opencv-contrib-android:$V" README.md; then
+            echo "::error file=README.md::does not mention the Maven Central version ($V) — likely stale."
+            exit 1
+          fi
+          echo "README.md is in sync with $V."