diff --git a/.github/workflows/actions/build/Dockerfile b/.github/workflows/actions/build/Dockerfile
new file mode 100644
index 0000000..b5cb46c
--- /dev/null
+++ b/.github/workflows/actions/build/Dockerfile
@@ -0,0 +1,3 @@
+FROM krisjusiak/dev:latest
+COPY build.sh /build.sh
+ENTRYPOINT ["sh", "/build.sh"]
diff --git a/.github/workflows/actions/build/action.yml b/.github/workflows/actions/build/action.yml
new file mode 100644
index 0000000..399caeb
--- /dev/null
+++ b/.github/workflows/actions/build/action.yml
@@ -0,0 +1,10 @@
+name: 'build'
+inputs:
+  CXX:
+    description: 'compiler'
+    required: true
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+  args:
+    - ${{ inputs.CXX }}
diff --git a/.github/workflows/actions/build/build.sh b/.github/workflows/actions/build/build.sh
new file mode 100755
index 0000000..c1d0e4f
--- /dev/null
+++ b/.github/workflows/actions/build/build.sh
@@ -0,0 +1,10 @@
+#!bin/sh
+
+cd /github/home/mp
+git submodule update --init
+
+mkdir build-$1
+cd build-$1
+CXX=$1 cmake .. -DBOOST_MP_BUILD_TESTS=ON -DBOOST_MP_BUILD_EXAMPLES=ON
+make -j8
+ctest --output-on-failure
diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index 5236ff1..9efaeaa 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -11,29 +11,19 @@ on:
       - main
       - develop
 
-env:
-  CTEST_OUTPUT_ON_FAILURE: 1
-  CPM_SOURCE_CACHE: ${{ github.workspace }}/cpm_modules
-
 jobs:
   build:
     runs-on: ubuntu-latest
-
+    name: build
     steps:
-      - uses: actions/checkout@v2
-
-      - uses: actions/cache@v2
+      - uses: actions/checkout@v1
         with:
-          path: "**/cpm_modules"
-          key: ${{ github.workflow }}-cpm-modules-${{ hashFiles('**/CMakeLists.txt', '**/*.cmake') }}
-
-      - name: configure
-        run: cmake -S . -B build
-
-      - name: build
-        run: cmake --build build -j
-
-      - name: test
-        run: |
-          cd build
-          ctest
+          submodules: true
+      - uses: ./.github/workflows/actions/build
+        name: clang
+        with:
+          CXX: clang++-16
+      - uses: ./.github/workflows/actions/build
+        name: gcc
+        with:
+          CXX: g++-12
diff --git a/.gitmodules b/.gitmodules
index f14cd9a..04ff125 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,3 @@
 [submodule "vendor/ut"]
 	path = vendor/ut
-	url = git@github.com:boost-ext/ut.git
+	url = https://github.com/boost-ext/ut.git