--- /dev/null
+++ b/.github/workflows/testnet-build.yml
@@ -0,0 +1,144 @@
+name: testnet-build
+
+# Controls when the action will run.
+on:
+ # Triggers the workflow on push or pull request events but only for the master branch
+  pull_request:
+    branches:
+      - master
+    types:
+      - opened
+      - reopened
+      - synchronize   #commit(s) pushed to the pull request
+      - ready_for_review
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+#Define Workflow variables
+env:
+  REPO_URL: ${{ github.server_url }}/${{ github.repository }}
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+
+  prepare-execution-marix:
+
+    name: Prepare execution matrix
+
+    runs-on: [self-hosted-ci,medium]
+    outputs:
+      matrix: ${{ steps.create_matrix.outputs.matrix }}
+
+    steps:
+
+      - name: Clean Workspace
+        uses: AutoModality/action-clean@v1.1.0
+
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - uses: actions/checkout@v3
+        with:
+          ref: ${{ github.head_ref }}  #Checking out head commit
+
+      - name: Read .env file
+        uses: xom9ikk/dotenv@v1.0.2
+
+      - name: Create Execution matrix
+        uses: fabiocaccamo/create-matrix-action@v2
+        id: create_matrix
+        with:
+          matrix: |
+            network {opal}, runtime {opal}, features {opal-runtime}
+            network {quartz}, runtime {quartz}, features {quartz-runtime}
+            network {unique}, runtime {unique}, features {unique-runtime}
+
+  testnet-build:
+    needs: prepare-execution-marix
+    # The type of runner that the job will run on
+    runs-on: [self-hosted-ci,medium]
+
+    timeout-minutes: 600
+
+    name: ${{ matrix.network }}
+
+    continue-on-error: true         #Do not stop testing of matrix runs failed.  As it decided during PR review - it required 50/50& Let's check it with false.
+
+    strategy:
+      matrix:
+        include: ${{fromJson(needs.prepare-execution-marix.outputs.matrix)}}
+
+    steps:
+       - name: Skip if pull request is in Draft
+         if: github.event.pull_request.draft == true
+         run: exit 1
+
+      - name: Clean Workspace
+        uses: AutoModality/action-clean@v1.1.0
+
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - uses: actions/checkout@v3
+        with:
+          ref: ${{ github.head_ref }}  #Checking out head commit
+
+      - name: Read .env file
+        uses: xom9ikk/dotenv@v1.0.2
+
+      - name: Generate ENV related extend file for docker-compose
+        uses: cuchi/jinja2-action@v1.2.0
+        with:
+          template: .docker/Dockerfile-testnet.j2
+          output_file: .docker/Dockerfile-testnet.${{ matrix.network }}.yml
+          variables: |
+            RUST_TOOLCHAIN=${{ env.RUST_TOOLCHAIN }}
+            NETWORK=${{ matrix.network }}
+            POLKADOT_BUILD_BRANCH=${{ env.POLKADOT_BUILD_BRANCH }}
+            POLKADOT_LAUNCH_BRANCH=${{ env.POLKADOT_LAUNCH_BRANCH }}
+            FEATURE=${{ matrix.features }}
+            RUNTIME=${{ matrix.runtime }}
+            BRANCH=${{ github.head_ref }}
+
+      - name: Show build configuration
+        run: cat .docker/Dockerfile-testnet.${{ matrix.network }}.yml
+
+      - name: Show launch-config configuration
+        run: cat launch-config.json
+
+      - name: Run find-and-replace to remove slashes from branch name
+        uses: mad9000/actions-find-and-replace-string@2
+        id: branchname
+        with:
+          source: ${{ github.head_ref }}
+          find: '/'
+          replace: '-'
+
+      - name: Log in to Docker Hub
+        uses: docker/login-action@v2.0.0
+        with:
+          username: ${{ secrets.CORE_DOCKERHUB_USERNAME }}
+          password: ${{ secrets.CORE_DOCKERHUB_TOKEN }}
+
+      - name: Pull polkadot docker image
+        run: docker pull uniquenetwork/builder-polkadot:${{ env.POLKADOT_BUILD_BRANCH }}           
+
+      - name: Build the stack
+        run: cd .docker/ && docker build --file ./Dockerfile-testnet.${{ matrix.network }}.yml --tag uniquenetwork/${{ matrix.network }}-testnet-local:nightly-${{ steps.branchname.outputs.value }}-${{ github.sha }} --tag uniquenetwork/${{ matrix.network }}-testnet-local::latest . 
+
+      - name: Push docker version image
+        run: docker push uniquenetwork/${{ matrix.network }}-testnet-local:nightly-${{ steps.branchname.outputs.value }}-${{ github.sha }}
+
+      - name: Push docker latest image
+        run: docker push uniquenetwork/${{ matrix.network }}-testnet-local:latest
+
+      - name: Clean Workspace
+        if: always()
+        uses: AutoModality/action-clean@v1.1.0
+
+      - name: Remove builder cache
+        if: always()                   # run this step always
+        run: |
+          docker builder prune -f
+          docker system prune -f