diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
new file mode 100644
index 000000000..5a1fe96c6
--- /dev/null
+++ b/.github/workflows/build.yml
@@ -0,0 +1,49 @@
+name: Build
+
+on:
+  push:
+    branches: ["develop", "master"]
+  pull_request:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v5
+        with:
+          distribution: temurin
+          java-version: 21
+          cache: maven
+
+      # Full reactor: morphium-core, poppydb, and all three optional extension
+      # modules (morphium-jakarta-data, quarkus-morphium, spring-boot-morphium).
+      # No -DskipExtensions here on purpose -- this is the only automated place
+      # that exercises the extensions at all; without it their tests only ever
+      # ran ad hoc.
+      #
+      # -Dquarkus.http.test-port=0: quarkus-morphium/integration-tests binds a
+      # fixed port (8081, Quarkus's own test default) in its @QuarkusTest runs.
+      # 0 tells Quarkus to pick a free ephemeral port instead. Not needed for
+      # morphium-core/poppydb/morphium-jakarta-data/spring-boot-morphium, but
+      # harmless there since only Quarkus reads the property at all.
+      - name: Build and test
+        run: mvn -B verify -Dquarkus.http.test-port=0
+
+      - name: Upload test reports
+        if: always()
+        uses: actions/upload-artifact@v7
+        with:
+          name: test-reports
+          path: '**/target/surefire-reports/*.xml'
+          retention-days: 7
diff --git a/pom.xml b/pom.xml
index fc9450cd8..12a86a6d1 100644
--- a/pom.xml
+++ b/pom.xml
@@ -56,13 +56,14 @@
     "mvn install"                    -> builds core + PoppyDB + all extensions
     "mvn install -DskipExtensions"    -> builds only core + PoppyDB (no Docker,
                                           no Quarkus/Spring download needed).
-                                          Skips BOTH extension modules currently
+                                          Skips ALL extension modules currently
                                           in the "extensions" profile below:
-                                          morphium-jakarta-data AND quarkus-morphium,
-                                          not just quarkus-morphium. quarkus-morphium
-                                          depends on morphium-jakarta-data, so this
-                                          reactor could not build one without the
-                                          other even if it tried to.
+                                          morphium-jakarta-data, quarkus-morphium,
+                                          AND spring-boot-morphium. quarkus-morphium
+                                          and spring-boot-morphium both depend on
+                                          morphium-jakarta-data, so this reactor
+                                          could not build one without the others
+                                          even if it tried to.
   -->
   <modules>
     <module>morphium-core</module>