add docker username and password as env vars

Signed-off-by: Moritz Wiesinger <moritz.wiesinger@dynatrace.com>

Author: mowies

.github/workflows/base-release.yaml

@@ -109,6 +109,8 @@ jobs:
           GORELEASER_KEY: ${{ secrets.GORELEASER_KEY }}
           GITHUB_TOKEN: ${{ secrets.GH_PAT }}
           COSIGN_YES: true
+          DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
+          DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
 
       - name: Move built artifacts
         if: inputs.distribution == 'otelcol-contrib'