chore: minor ci tweaks

Author: joseluisq

.github/workflows/release-8.0.yml

@@ -34,6 +34,11 @@ jobs:
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
+      -
+        name: Prepare Docker envs
+        shell: bash
+        run: |
+          echo "VERSION=${GITHUB_REF##*/v}" >> $GITHUB_ENV
       -
         name: Build and push
         uses: docker/build-push-action@v2
@@ -44,3 +49,5 @@ jobs:
           # platforms: linux/amd64,linux/386,linux/arm64,linux/arm/v7,linux/arm/v6
           file: 8.0/Dockerfile
           tags: ${{ steps.meta.outputs.tags }}
+          build-args: |
+            VERSION=${{ env.VERSION }}

README.md

@@ -25,6 +25,13 @@ mysqlshow
 
 For more details see official [MySQL 8 Client Programs](https://dev.mysql.com/doc/refman/8.0/en/programs-client.html) documentation.
 
+## Usage
+
+```sh
+docker run -it --rm joseluisq/mysql-client mysql --version
+# mysql  Ver 8.0.28 for Linux on x86_64 (MySQL Community Server - GPL)
+```
+
 ## User privileges
 
 - Default user (unprivileged) is `mysql`.