Update build-docker to check out the trunk and release branches instead of tags when building the compiler from source

Author: finagolfin

swift-ci/sdks/android/build-docker

@@ -26,7 +26,15 @@ HOST_OS=ubuntu24.04
 source ./scripts/toolchain-vars.sh
 
 # Check-out and patch the sources
+if [[ "${BUILD_COMPILER}" != "1" ]]; then
 ./scripts/fetch-source.sh --source-dir ${WORKDIR}/source --swift-tag ${SWIFT_TAG}
+else
+if [[ "${BUILD_SCHEME}" == "development" ]]; then
+./scripts/fetch-source.sh --source-dir ${WORKDIR}/source --swift-scheme main
+else
+./scripts/fetch-source.sh --source-dir ${WORKDIR}/source --swift-scheme release/6.2
+fi
+fi
 ./patches/apply-patches.sh ${WORKDIR}/source/swift-project
 
 mkdir -p ${WORKDIR}/products