Add documentation about changes to buildah-oci-ta

deploy/tasks/README.md

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+# Task Definitions
+
+Note that while `pre-build.yaml` and `maven-deployment.yaml` are created by our team the `buildah-oci-yaml` is a temporary copy from https://github.com/konflux-ci/build-definitions/blob/main/task/buildah-oci-ta/0.2/buildah-oci-ta.yaml.
+
+
+## buildah-oci-ta
+
+It should be base-lined to the most recent definition from Konflux build-definitions repository and then the following changes should be applied to that:
+
+### Indy Sidecar
+Adds Indy configuration to the build:
+* https://github.com/redhat-appstudio/jvm-build-service/blob/main/deploy/tasks/buildah-oci-ta.yaml#L134-L137
+* https://github.com/redhat-appstudio/jvm-build-service/blob/main/deploy/tasks/buildah-oci-ta.yaml#L170-L180
+* https://github.com/redhat-appstudio/jvm-build-service/blob/main/deploy/tasks/buildah-oci-ta.yaml#L737-L757
+
+
+### Trusted CA
+Adds the trusted ca to the build:
+* https://github.com/redhat-appstudio/jvm-build-service/blob/main/deploy/tasks/buildah-oci-ta.yaml#L504-L508
+