SDCICD-1358: custom task to get OLM bundle version

this is needed to string together the dynamic bundle generation task to
the catalog generation task. The bundle ref is stored as a param in the
catalog pipeline (nudged), we need to fetch the version that was put in
the bundle to add an entry into the catalog with it.

```
❯ opm render ${BUNDLE_IMAGE}
{
    "schema": "olm.bundle",
    "name": "osd-example-operator.v4.16.0-28f1940",
    "package": "osd-example-operator",
    "image": "quay.io/redhat-user-workloads/oeo-cicada-tenant/osd-example-operator/bundle@sha256:5485652c17ab8ac5cf44452f67e15ed06dc9d2d7d67a7f079e76248878d5370e",
    "properties": [
        {
            "type": "olm.gvk",
            "value": {
                "group": "managed.openshift.io",
                "kind": "Example",
                "version": "v1alpha1"
            }
        },
        {
            "type": "olm.package",
            "value": {
                "packageName": "osd-example-operator",
                "version": "4.16.0-28f1940"
            }
        },
...
❯ opm render ${BUNDLE_IMAGE} \
          | sed -n '/"type": "olm.package"/,/}/p' \
          | sed -n 's/.*"version": "\(.*\)".*/\1/p'
          | tr -d '\n'
4.16.0-28f1940
```

https://github.com/openshift/osd-example-operator/blob/971083313e7eb4c7383c04a2067ac80ae535946c/.tekton/catalog-push.yaml#L176-L211

https://issues.redhat.com/browse/SDCICD-1358

Signed-off-by: Brady Pratt <[email protected]>

task/opm-get-bundle-version/0.1/README.md

@@ -0,0 +1,14 @@
+# opm-get-bundle-version task
+
+Fetch the current version of the provided OLM bundle image
+
+## Parameters
+|name|description|default value|required|
+|---|---|---|---|
+|bundle-image|OLM bundle image to query||true|
+
+## Results
+|name|description|
+|---|---|
+|bundle-version|olm.package version|
+

task/opm-get-bundle-version/0.1/opm-get-bundle-version.yaml

@@ -0,0 +1,27 @@
+---
+apiVersion: tekton.dev/v1beta1
+kind: Task
+metadata:
+  name: opm-get-bundle-version
+spec:
+  description: Fetch the current version of the provided OLM bundle image
+  params:
+    - name: bundle-image
+      description: OLM bundle image to query
+  results:
+    - name: bundle-version
+      description: olm.package version
+  steps:
+    - name: opm-get-bundle-version
+      image: "registry.redhat.io/openshift4/ose-operator-registry:latest"
+      env:
+        - name: BUNDLE_IMAGE
+          value: $(params.bundle-image)
+      script: |
+        #!/usr/bin/env bash
+        set -xeo pipefail
+        opm render ${BUNDLE_IMAGE} \
+          | sed -n '/"type": "olm.package"/,/}/p' \
+          | sed -n 's/.*"version": "\(.*\)".*/\1/p' \
+          | tr -d '\n' \
+          > "$(results.bundle-version.path)"

task/opm-get-bundle-version/OWNERS

@@ -0,0 +1,6 @@
+approvers:
+- jbpratt
+- gurnben
+reviewers:
+- jbpratt
+- gurnben