diff --git a/.circleci/config.yml b/.circleci/config.yml
index 8bc6674b..184bb4a6 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -14,28 +14,10 @@ templates:
       - CGO_ENABLED: 0
       - GO111MODULE: "auto"
 
-  go120-template: &go120-template
-    docker:
-      - image: cimg/go:1.20
-
-  go121-template: &go121-template
-    docker:
-      - image: cimg/go:1.21
-
   go122-template: &go122-template
     docker:
       - image: cimg/go:1.22
 
-  build-gomod-multi-template: &build-gomod-multi-template
-    steps:
-      - checkout
-      - run:
-          name: build u-root & gokrazy & p9 together (workspaces)
-          command: ./test-external.sh
-      - run:
-          name: build u-root & cpu & p9 together (GOPATH)
-          command: ./test-external-gopath.sh
-
 workflows:
   version: 2
   build:
@@ -43,30 +25,6 @@ workflows:
       - clean-gopath
       - clean-gomod
       - clean-makebb
-      - build-gomod-multi-go120:
-          requires:
-            - clean-makebb
-            - clean-gomod
-      - build-gomod-multi-go121:
-          requires:
-            - clean-makebb
-            - clean-gomod
-      - build-gomod-multi-go122:
-          requires:
-            - clean-makebb
-            - clean-gomod
-  nightly:
-    triggers:
-      - schedule:
-          cron: "0 0 * * *"
-          filters:
-            branches:
-              only:
-                - main
-    jobs:
-      - build-gomod-multi-go120
-      - build-gomod-multi-go121
-      - build-gomod-multi-go122
 
 jobs:
   clean-makebb:
@@ -148,11 +106,3 @@ jobs:
             (cd src && test -z "$(gofmt -s -l $(find -name '*.go'))")
             (cd test && test -z "$(gofmt -s -l $(find -name '*.go'))")
 
-  build-gomod-multi-go120:
-    <<: [*go120-template, *gomod-template, *build-gomod-multi-template]
-
-  build-gomod-multi-go121:
-    <<: [*go121-template, *gomod-template, *build-gomod-multi-template]
-
-  build-gomod-multi-go122:
-    <<: [*go122-template, *gomod-template, *build-gomod-multi-template]
diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index 408e8a42..9ae0fed5 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -131,3 +131,59 @@ jobs:
           fail_ci_if_error: true
           verbose: true
 
+  test-external-workspaces:
+    name: test-external-workspaces
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        goversion: ['1.20', '1.21.x', '1.22.x']
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: ${{ matrix.goversion }}
+
+      - name: Test
+        run: |
+          mkdir cover
+          GOCOVERDIR=$(pwd)/cover ./test-external-workspaces.sh
+          go tool covdata textfmt -i=cover -o cover.out
+
+      - uses: codecov/codecov-action@036b81c4b4e8314b391265bc226440f9e2117e2a
+        env:
+          CODECOV_TOKEN: 'bf25d8b2-b4f9-43f4-b578-64eefbe31e61'
+        with:
+          flags: ${{ matrix.goversion }}
+          fail_ci_if_error: true
+          verbose: true
+
+  test-external-gopath:
+    name: test-external-gopath
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        goversion: ['1.20', '1.21.x', '1.22.x']
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: ${{ matrix.goversion }}
+
+      - name: Test
+        run: |
+          mkdir cover
+          GOCOVERDIR=$(pwd)/cover ./test-external-gopath.sh
+          go tool covdata textfmt -i=cover -o cover.out
+
+      - uses: codecov/codecov-action@036b81c4b4e8314b391265bc226440f9e2117e2a
+        env:
+          CODECOV_TOKEN: 'bf25d8b2-b4f9-43f4-b578-64eefbe31e61'
+        with:
+          flags: ${{ matrix.goversion }}
+          fail_ci_if_error: true
+          verbose: true
+
diff --git a/test-external.sh b/test-external-workspaces.sh
similarity index 98%
rename from test-external.sh
rename to test-external-workspaces.sh
index b557059d..2691fde9 100755
--- a/test-external.sh
+++ b/test-external-workspaces.sh
@@ -9,8 +9,7 @@ fi
 
 cd src/cmd/makebb
 
-$GO generate
-$GO build
+$GO build -covermode=atomic
 
 cd ../../..