Add opensearch-k8s-operator package (#31311)

Please, sir, I would like to add `opensearch-k8s-operator` package.

There is no explicitly project support policy. There is, implicitly,
only one supported version. See
https://github.com/opensearch-project/opensearch-k8s-operator.

### Pre-review Checklist

- [x] REQUIRED - The package is available under an OSI-approved or
FSF-approved license
- [x] REQUIRED - The version of the package is still receiving security
updates
- [x] This PR links to the upstream project's support policy (e.g.
`endoflife.date`)

---------

Signed-off-by: John Speed Meyers <[email protected]>

opensearch-k8s-operator.yaml

@@ -0,0 +1,42 @@
+package:
+  name: opensearch-k8s-operator
+  version: 2.6.1
+  epoch: 0
+  description: OpenSearch Kubernetes Operator
+  copyright:
+    - license: Apache-2.0
+
+pipeline:
+  - uses: git-checkout
+    with:
+      repository: https://github.com/opensearch-project/opensearch-k8s-operator
+      tag: v${{package.version}}
+      expected-commit: b2417013b570cc2dec3acd8204c15f73ba887efa
+
+  - uses: go/bump
+    with:
+      modroot: ./opensearch-operator
+      deps: golang.org/x/[email protected] google.golang.org/[email protected]
+
+  - uses: go/build
+    with:
+      packages: ./opensearch-operator
+      output: manager
+
+subpackages:
+  - name: ${{package.name}}-compat
+    pipeline:
+      - runs: |
+          mkdir -p ${{targets.contextdir}}
+          ln -sf /usr/bin/manager ${{targets.contextdir}}/manager
+
+update:
+  enabled: true
+  github:
+    identifier: opensearch-project/opensearch-k8s-operator
+    strip-prefix: v
+
+test:
+  pipeline:
+    - runs: |
+        manager --help