diff --git a/.github/actions/stc_docker/Dockerfile b/.github/actions/stc_docker/Dockerfile
new file mode 120000
index 0000000..dcbd8a2
--- /dev/null
+++ b/.github/actions/stc_docker/Dockerfile
@@ -0,0 +1 @@
+../../../Dockerfile
\ No newline at end of file
diff --git a/.github/actions/stc_docker/action.yml b/.github/actions/stc_docker/action.yml
new file mode 120000
index 0000000..850b616
--- /dev/null
+++ b/.github/actions/stc_docker/action.yml
@@ -0,0 +1 @@
+../../../action.yml
\ No newline at end of file
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
new file mode 100644
index 0000000..7332049
--- /dev/null
+++ b/.github/workflows/main.yml
@@ -0,0 +1,29 @@
+on: [push]
+
+jobs:
+  stc_rpncalc_ci_job:
+    runs-on: ubuntu-latest
+    name: Test building
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Docker layer cache
+        uses: satackey/action-docker-layer-caching@v0.0.8
+      - name: Docker
+        run: $GITHUB_WORKSPACE/steps/compose_build.sh
+      - name: Desktop build/check
+        run: $GITHUB_WORKSPACE/steps/compose_run.sh desktop_build_check.sh --rebuild
+      - name: Calc build
+        run: $GITHUB_WORKSPACE/steps/compose_run.sh build_calc.sh
+      - name: ls
+        run: ls $GITHUB_WORKSPACE
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v2
+        with:
+          name: stc_rpncalc_artifacts
+          path: |
+            ${{ github.workspace }}/build/
+            ${{ github.workspace }}/build_qt/lcov/
+            ${{ github.workspace }}/build_qt/decn.c.gcov
+            ${{ github.workspace }}/main.hex
+          if-no-files-found: error
diff --git a/.gitignore b/.gitignore
index 10bfdec..6244943 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+*.swp
 *.hex
 *.bak
 CMakeLists.txt.user
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..253b0b0
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,16 @@
+FROM ubuntu:18.04
+
+RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
+	build-essential \
+	catch \
+	clang \
+	cmake \
+	git \
+	lcov \
+	libboost-dev \
+	libgmp-dev \
+	libmpfr-dev \
+	ninja-build \
+	qtdeclarative5-dev \
+	sdcc=3.5.0+dfsg-2build1 \
+	vim-tiny
diff --git a/action.yml b/action.yml
new file mode 100644
index 0000000..886c096
--- /dev/null
+++ b/action.yml
@@ -0,0 +1,7 @@
+# GitHub Actions
+
+name: 'STC RPN Calc CI build'
+description: 'run CI build in docker container'
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
diff --git a/steps/build_calc.sh b/steps/build_calc.sh
new file mode 100755
index 0000000..0ec3bc9
--- /dev/null
+++ b/steps/build_calc.sh
@@ -0,0 +1,9 @@
+#!/bin/bash
+
+set -e
+
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+
+# build
+cd $SCRIPT_DIR/..
+make
diff --git a/steps/compose_build.sh b/steps/compose_build.sh
new file mode 100755
index 0000000..579d976
--- /dev/null
+++ b/steps/compose_build.sh
@@ -0,0 +1,9 @@
+#!/bin/bash
+
+set -e
+
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+
+# build
+cd $SCRIPT_DIR
+docker-compose build
diff --git a/steps/compose_run.sh b/steps/compose_run.sh
new file mode 100755
index 0000000..d2ded9a
--- /dev/null
+++ b/steps/compose_run.sh
@@ -0,0 +1,21 @@
+#!/bin/bash
+
+set -e
+
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+
+# set GITHUBWORKSPACE if building locally
+if [[ -z "${GITHUB_WORKSPACE}" ]]; then
+    export GITHUB_WORKSPACE="$SCRIPT_DIR/.."
+fi
+echo "GITHUB_WORKSPACE: ${GITHUB_WORKSPACE}"
+
+# build
+cd $SCRIPT_DIR
+
+if [ "$#" -eq 0 ]; then
+    # start shell
+    docker-compose run build_tools bash
+else
+    docker-compose run build_tools /code/steps/$1
+fi
diff --git a/steps/desktop_build_check.sh b/steps/desktop_build_check.sh
new file mode 100755
index 0000000..94601a4
--- /dev/null
+++ b/steps/desktop_build_check.sh
@@ -0,0 +1,27 @@
+#!/bin/bash
+
+set -e
+
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+
+# build
+cd $SCRIPT_DIR/..
+if [ "$1" == "--rebuild" ]; then
+    rm -rf build_qt
+    mkdir build_qt
+else
+    mkdir -p build_qt
+fi
+cd build_qt
+cmake .. -GNinja
+ninja
+
+# run tests
+src/decn/decn_tests
+
+# get coverage
+echo "Running lcov"
+lcov --capture --directory src/decn --output-file coverage.info
+genhtml coverage.info --output-directory lcov
+echo "Running gcov"
+gcov -b src/decn/CMakeFiles/decn_cover.dir/decn.c.gcno
\ No newline at end of file
diff --git a/steps/docker-compose.yml b/steps/docker-compose.yml
new file mode 100644
index 0000000..8921a02
--- /dev/null
+++ b/steps/docker-compose.yml
@@ -0,0 +1,10 @@
+version: '3.2'
+services:
+    build_tools:
+        build:
+            context: ..
+            dockerfile: Dockerfile
+        volumes:
+          - type: bind
+            source: $GITHUB_WORKSPACE
+            target: /code