Add cache config deprecations table to docs

docs/configuration/advanced-configuration.md

@@ -513,6 +513,25 @@ With GitLab Runner 11.3.0, the configuration parameters related to S3 were moved
 The old format of the configuration with S3 configured directly in `[runners.cache]` section is still supported,
 but is deprecated with GitLab Runner 11.3.0. **This support will be removed in GitLab Runner 12.0.0**.
 
+Bellow is a table containing a summary of `config.toml`, cli options and ENV variables deprecations:
+
+| Setting             | TOML field                               | CLI option for `register`      | ENV for `register`                | deprecated TOML field               | deprecated CLI option   | deprecated ENV        |
+|---------------------|------------------------------------------|--------------------------------|-----------------------------------|-------------------------------------|-------------------------|-----------------------|
+| Type                | `[runners.cache] -> Type`                | `--cache-type`                 | `$CACHE_TYPE`                     |                                     |                         |                       |
+| Path                | `[runners.cache] -> Path`                | `--cache-path`                 | `$CACHE_PATH`                     |                                     | `--cache-s3-cache-path` | `$S3_CACHE_PATH`      |
+| Shared              | `[runners.cache] -> Shared`              | `--cache-shared`               | `$CACHE_SHARED`                   |                                     | `--cache-cache-shared`  |                       |
+| S3.ServerAddress    | `[runners.cache.s3] -> ServerAddress`    | `--cache-s3-server-address`    | `$CACHE_S3_SERVER_ADDRESS`        | `[runners.cache] -> ServerAddress`  |                         | `$S3_SERVER_ADDRESS`  |
+| S3.AccessKey        | `[runners.cache.s3] -> AccessKey`        | `--cache-s3-access-key`        | `$CACHE_S3_ACCESS_KEY`            | `[runners.cache] -> AccessKey`      |                         | `$S3_ACCESS_KEY`      |
+| S3.SecretKey        | `[runners.cache.s3] -> SecretKey`        | `--cache-s3-secret-key`        | `$CACHE_S3_SECRET_KEY`            | `[runners.cache] -> SecretKey`      |                         | `$S3_SECRET_KEY`      |
+| S3.BucketName       | `[runners.cache.s3] -> BucketName`       | `--cache-s3-bucket-name`       | `$CACHE_S3_BUCKET_NAME`           | `[runners.cache] -> BucketName`     |                         | `$S3_BUCKET_NAME`     |
+| S3.BucketLocation   | `[runners.cache.s3] -> BucketLocation`   | `--cache-s3-bucket-location`   | `$CACHE_S3_BUCKET_LOCATION`       | `[runners.cache] -> BucketLocation` |                         | `$S3_BUCKET_LOCATION` |
+| S3.Insecure         | `[runners.cache.s3] -> Insecure`         | `--cache-s3-insecure`          | `$CACHE_S3_INSECURE`              | `[runners.cache] -> Insecure`       |                         | `$S3_INSECURE`        |
+| GCS.AccessID        | `[runners.cache.gcs] -> AccessID`        | `--cache-gcs-access-id`        | `$CACHE_GCS_ACCESS_ID`            |                                     |                         |                       |
+| GCS.PrivateKey      | `[runners.cache.gcs] -> PrivateKey`      | `--cache-gcs-private-key`      | `$CACHE_GCS_PRIVATE_KEY`          |                                     |                         |                       |
+| GCS.CredentialsFile | `[runners.cache.gcs] -> CredentialsFile` | `--cache-gcs-credentials-file` | `$GOOGLE_APPLICATION_CREDENTIALS` |                                     |                         |                       |
+| GCS.BucketName      | `[runners.cache.gcs] -> BucketName`      | `--cache-gcs-bucket-name`      | `$CACHE_GCS_BUCKET_NAME`          |                                     |                         |                       |
+
+
 ### The `[runners.cache.s3]` section
 
 NOTE: **Note:**