If codegen artifact already exists:

      - DRY_RUN=true -> continue with notice.
      - otherwise preserve existing recovery/fail logic.

Author: ewaostrowska

CI/release/resolve-release-versions.sh

@@ -11,6 +11,7 @@ previous_generators_version="${PREVIOUS_GENERATORS_VERSION:-}"
 bootstrap_codegen_version="${CODEGEN_GENERATORS_BOOTSTRAP_VERSION:-}"
 generators_existing_behavior="${GENERATORS_EXISTING_BEHAVIOR:-skip}"
 skip_maven_deploy="${SKIP_MAVEN_DEPLOY:-false}"
+dry_run="${DRY_RUN:-false}"
 next_codegen_snapshot_version="${NEXT_CODEGEN_SNAPSHOT_VERSION:-}"
 
 [[ "${release_generators}" == "true" || "${release_generators}" == "false" ]] || fail "RELEASE_GENERATORS must be true or false"
@@ -27,7 +28,9 @@ require_snapshot_version "NEXT_CODEGEN_SNAPSHOT_VERSION" "${next_codegen_snapsho
 codegen_exists="false"
 if release_artifact_exists "${CODEGEN_ARTIFACT}" "${codegen_version}"; then
   codegen_exists="true"
-  if [[ "${skip_maven_deploy}" != "true" ]]; then
+  if [[ "${dry_run}" == "true" ]]; then
+    notice "Codegen artifact ${CODEGEN_ARTIFACT}:${codegen_version} already exists; continuing because DRY_RUN=true."
+  elif [[ "${skip_maven_deploy}" != "true" ]]; then
     fail "Codegen artifact ${CODEGEN_ARTIFACT}:${codegen_version} already exists in Maven Central. Rerun with skip_maven_deploy=true only for recovery."
   fi
 fi
@@ -53,7 +56,7 @@ if [[ "${release_generators}" == "true" ]]; then
     notice "Generator artifact ${generators_version} does not exist; generator deploy is required."
   fi
 
-  if [[ "${generators_deploy_needed}" == "true" && "${skip_maven_deploy}" == "true" ]]; then
+  if [[ "${generators_deploy_needed}" == "true" && "${skip_maven_deploy}" == "true" && "${dry_run}" != "true" ]]; then
     fail "Generator artifact ${generators_version} does not exist, but skip_maven_deploy=true would skip publishing it. Publish generators first or rerun without skip_maven_deploy."
   fi
 
@@ -82,7 +85,7 @@ if [[ "${release_generators}" == "true" ]]; then
   fi
   assert_maven_resolves "io.swagger.codegen.v3:${GENERATORS_ARTIFACT}:${bootstrap_generators_version}"
 
-  if [[ "${generators_deploy_needed}" == "true" && "${DRY_RUN:-false}" == "true" ]]; then
+  if [[ "${generators_deploy_needed}" == "true" && "${dry_run}" == "true" ]]; then
     codegen_build_generators_version="${bootstrap_generators_version}"
     notice "Dry run will build codegen with bootstrap generators ${codegen_build_generators_version}; release deploy will use ${generators_version} after generators are published."
   else