chore: prepare Changelog and Migr. Guide for 0.3.4

CHANGELOG.md

@@ -7,6 +7,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.3.3] - 2023-04-28
+
+### Fixed
+
+- Added license headers to several files in the code base
+- Refactoring of Helm charts - multiple charts instead of one dynamically assembled chart
+
 ## [0.3.3] - 2023-04-19
 
 ### Fixed

docs/migration/Version_0.3.3_0.3.4.md

@@ -0,0 +1,21 @@
+# Migration from 0.3.4 to 0.3.4
+
+## Refactoring of Helm Charts
+
+In issue [#136](https://github.com/eclipse-tractusx/tractusx-edc/issues/136) work has begun to split the Helm charts up
+into several technology-focused charts:
+
+- In-memory: for testing and development
+- PostgreSQL+Hashicorp: this is the **recommended** distribution of Tractus-X EDC
+- (Azure KeyVault: uses Azure KeyVault instead of Hashicorp Vault.) - Work in Progress
+
+Unfortunately, due to time constraints, we had to release 0.3.4 **without** the Azure KeyVault chart, it will be
+included in one of the subsequent releases in the future.
+
+**Please note that the Azure KeyVault variant is not included in the 0.3.4 Release! If you rely on AZKV please do NOT
+upgrade to 0.3.4 yet!**
+
+## Change in Docker image publishing
+
+Starting with the 0.3.3 release we switched over to publish our Docker images
+to [Docker Hub](https://hub.docker.com/search?q=tractusx) instead of GHCR.