Add versioning information and update renovate (#547)

.github/renovate.json

@@ -3,7 +3,7 @@
     "github>rancher/renovate-config#release"
   ],
   "baseBranches": [
-    "main"
+    "main", "release/v0.6", "release/v0.5", "release/v0.4", "release/v0.3"
   ],
   "prHourlyLimit": 2,
   "enabledManagers": [
@@ -14,4 +14,4 @@
     "regex",
     "gomod"
   ]
-}
+}

README.md

@@ -196,3 +196,7 @@ distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
+
+# Versioning
+
+See [VERSION.md](VERSION.md).

VERSION.md

@@ -0,0 +1,9 @@
+Rancher's Webhook follows a pre-release (v0.x) strategy of semver. There no compatibility between releases. Instead, each Webhook version aims to be compatible with a single version of Rancher. The current supported versions of the Webhook (and the compatible version of rancher) are as follows:
+
+| Webhook Branch | Webhook Minor version | Rancher Minor Version |
+|--------------------------|------------------------------------|------------------------------------------------|
+| main | v0.7 | v2.11 |
+| release/v0.6 | v0.6 | v2.10 |
+| release/v0.5 | v0.5 | v2.9 |
+| release/v0.4 | v0.4 | v2.8 |
+| release/v0.3 | v0.3 | v2.7 |