add stable.txt

Add `stable.txt`, a file in the master branch that always points to the latest stable release of Cilium. This file can be used as a reference by tools such as the Cilium CLI to get the latest stable release version. This pattern and file is already applied to the Hubble CLI repository. Ultimately, this new file will allow the Cilium CLI to always install the latest version of Cilium, as initially planned[0], instead of the version hardcoded in the CLI binary. [0]: cilium/cilium-cli#121 (comment) Signed-off-by: Robin Hahling <robin.hahling@gw-computing.net>
cilium · Jun 7, 2021 · b176018 · b176018
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diff --git a/Documentation/contributing/release/stable.rst b/Documentation/contributing/release/stable.rst
@@ -160,6 +160,13 @@ Reference steps for the template
 
       git checkout -b pr/bump-readme-vX.Y.Z origin/master
       contrib/release/bump-readme.sh
+   
+   When the release is the latest stable release, bump the version in the
+   ``stable.txt`` file.
+
+   ::
+
+      echo "vX.Y.Z" > stable.txt
       # (Commit changes & submit PR)
 
 #. Bump the version of Cilium used in the Cilium upgrade tests to use the new release

diff --git a/stable.txt b/stable.txt
@@ -0,0 +1 @@
+v1.10.0