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e53962a2a4
On self-hosted runners toolchains.xml may survive multiple runs and unexpectedly grow as a result of the toolchains setup simply appending the JDK definition even if one with the same `type` and `provides.id` already exists. Restructuring the parsing step and filtering the potentially existing list of toolchain definitions prevents this and also fixes toolchain.xml files that already contain duplicates. Fixes #530