diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 91add81f44ae..422da26aa465 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -600,6 +600,44 @@ jobs:
           external_repository: lampepfl/dotty-website
           publish_branch: gh-pages
 
+  nightly_unmanaged_community_build:
+    # Self-hosted runner is used only for getting current build version
+    runs-on: [self-hosted, Linux]
+    container:
+      image: lampepfl/dotty:2021-03-22
+      options: --cpu-shares 4096
+      volumes:
+        - ${{ github.workspace }}/../../cache/sbt:/root/.sbt
+        - ${{ github.workspace }}/../../cache/ivy:/root/.ivy2/cache
+        - ${{ github.workspace }}/../../cache/general:/root/.cache
+    needs: [publish_nightly]
+    if: "(github.event_name == 'schedule' || github.event_name == 'workflow_dispatch') && github.repository == 'lampepfl/dotty'"
+    env:
+      NIGHTLYBUILD: yes
+    steps:
+      - name: Reset existing repo
+        run: git -c "http.https://github.com/.extraheader=" fetch --recurse-submodules=no "https://github.com/lampepfl/dotty" && git reset --hard FETCH_HEAD || true
+
+      - name: Checkout cleanup script
+        uses: actions/checkout@v2
+
+      - name: Cleanup
+        run: .github/workflows/cleanup.sh
+
+      - name: Git Checkout
+        uses: actions/checkout@v2
+
+      - name: Add SBT proxy repositories
+        run: cp -vf .github/workflows/repositories /root/.sbt/ ; true
+
+      - name: Get version string for this build
+        run: |
+          ver=$(./project/scripts/sbt "print scala3-compiler-bootstrapped/version" | tail -n1)
+          echo "This build version: $ver"
+          echo "THISBUILD_VERSION=$ver" >> $GITHUB_ENV
+      # Steps above are copy-pasted from publish_nightly, needed only to resolve THISBUILD_VERSION
+      - name: Trigger unmanaged community build
+        run: .github/workflows/scripts/triggerUnmanagedCommunityBuild.sh "${{ secrets.BUILD_TOKEN }}" "$THISBUILD_VERSION"
 
   publish_release:
     runs-on: [self-hosted, Linux]
diff --git a/.github/workflows/scripts/triggerUnmanagedCommunityBuild.sh b/.github/workflows/scripts/triggerUnmanagedCommunityBuild.sh
new file mode 100755
index 000000000000..694428e29bb5
--- /dev/null
+++ b/.github/workflows/scripts/triggerUnmanagedCommunityBuild.sh
@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+
+# This is script for triggering unamanged community build upon releasing nightly version.
+# Script sends request to CB Jenkins instance to start the build for given released Scala version
+# Prints url of created job to stdout
+#
+# Requirement:
+#   - the latest (nightly) version of scala should be published
+
+set -u
+
+if [ $# -ne 2 ]; then
+  echo "Wrong number of script arguments, expected <token> <scala-version>, got $#: $@"
+  exit 1
+fi
+
+CB_ENDPOINT=https://scala3.westeurope.cloudapp.azure.com
+CB_BUILD_TOKEN="$1"
+SCALA_VERSION="$2"
+
+startRunResponse=$(curl "${CB_ENDPOINT}/job/runBuild/buildWithParameters?token=${CB_BUILD_TOKEN}&publishedScalaVersion=${SCALA_VERSION}" -v 2>&1)
+echo "${startRunResponse}"
+queueItem=$(echo "${startRunResponse}" | grep -oP "< Location: \K[\w\d:/.//]+")
+# Wait until Jenkins does acknowledge the build (max 1 min )
+for i in {1..12}; do
+  buildUrl=$(curl -s "${queueItem}/api/json?tree=executable[url]" | jq .executable.url)
+  if [[ "null" == "${buildUrl}" ]]; then
+    echo "Waiting for build start..."
+    sleep 5
+  else
+    echo "Created build url: ${buildUrl}"
+    exit 0
+  fi
+done
+
+# Set error if failed to resolve build url
+exit 1