diff --git a/.github/workflows/build_pull_request.yml b/.github/workflows/build_pull_request.yml
index 2add0e4..4636b92 100644
--- a/.github/workflows/build_pull_request.yml
+++ b/.github/workflows/build_pull_request.yml
@@ -1,6 +1,7 @@
 name: Check the Docker image builds for a PR
 
 on:
+  workflow_dispatch:
   pull_request:
 
 jobs:
@@ -19,6 +20,24 @@ jobs:
 
   check_build:
     runs-on: ubuntu-latest
+    env:
+      APP_GH_REF: develop
+      APP_GH_ADD_SHA: "true"
+    services:
+      mysql:
+        image: mysql:8.0
+        env:
+          MYSQL_ROOT_PASSWORD: root
+          MYSQL_DATABASE: librebooking
+          MYSQL_USER: librebooking
+          MYSQL_PASSWORD: librebooking
+        ports:
+          - 3306:3306
+        options: >-
+          --health-cmd="mysqladmin ping -h 127.0.0.1 -proot"
+          --health-interval=10s
+          --health-timeout=5s
+          --health-retries=5
     steps:
       -
         name: Checkout github repository
@@ -26,15 +45,6 @@ jobs:
       -
         name: Setup Docker buildx
         uses: docker/setup-buildx-action@v4
-      -
-        name: Set pull request build arguments
-        id: pr_meta
-        run: |
-          appGitRef=develop
-          appAddSha=true
-
-          echo "appGitRef=$appGitRef" >> "$GITHUB_OUTPUT"
-          echo "appAddSha=$appAddSha" >> "$GITHUB_OUTPUT"
       -
         name: Build Docker image
         uses: docker/build-push-action@v7
@@ -44,7 +54,74 @@ jobs:
           build-args: |
             VERSION_PHP=8.4
             VERSION_COMPOSER=lts
-            APP_GH_REF=${{ steps.pr_meta.outputs.appGitRef }}
-            APP_GH_ADD_SHA=${{ steps.pr_meta.outputs.appAddSha }}
-          load: false
+            APP_GH_REF=${{ env.APP_GH_REF }}
+            APP_GH_ADD_SHA=${{ env.APP_GH_ADD_SHA }}
+          tags: librebooking-pr:${{ github.sha }}
+          load: true
           push: false
+      -
+        name: Smoke test image
+        run: |
+          set -euo pipefail
+          lb_image_tag="librebooking-pr:${GITHUB_SHA}"
+          mysql_service_id="${{ job.services.mysql.id }}"
+
+          docker create --name librebooking-smoke-src "${lb_image_tag}" >/dev/null
+          docker cp librebooking-smoke-src:/var/www/html/database_schema /tmp/librebooking-database_schema
+          docker rm librebooking-smoke-src
+
+          cat \
+            /tmp/librebooking-database_schema/create-db.sql \
+            /tmp/librebooking-database_schema/create-schema.sql \
+            | docker exec --interactive "${mysql_service_id}" mysql --user root --password=root
+
+          docker run --rm \
+            --add-host host.docker.internal:host-gateway \
+            "${lb_image_tag}" \
+            php /var/www/html/phing-tasks/UpgradeDbTask.php \
+              librebooking \
+              librebooking \
+              host.docker.internal \
+              librebooking \
+              /var/www/html/database_schema
+
+          docker run --detach \
+            --name librebooking-smoke \
+            --add-host host.docker.internal:host-gateway \
+            --publish 18080:8080 \
+            --env LB_DATABASE_HOSTSPEC=host.docker.internal \
+            --env LB_DATABASE_NAME=librebooking \
+            --env LB_DATABASE_USER=librebooking \
+            --env LB_DATABASE_PASSWORD=librebooking \
+            "${lb_image_tag}"
+
+          for attempt in $(seq 1 30); do
+            if curl --silent --show-error --fail --max-time 2 http://127.0.0.1:18080/Web/; then
+              echo "Connected to docker image successfully"
+              break
+            fi
+
+            if [ "${attempt}" = "30" ]; then
+              echo "Smoke test failed: HTTP endpoint did not become ready" >&2
+              docker logs librebooking-smoke || true
+              docker logs "${{ job.services.mysql.id }}" || true
+              exit 1
+            fi
+
+            sleep 2
+          done
+
+          modules_count=$(docker exec librebooking-smoke php -m | grep -Ec '^(gd|ldap|mysqli|timezonedb)$' || true)
+          if [ "${modules_count}" -ne 4 ]; then
+            echo "Smoke test failed: expected 4 required PHP modules (gd, ldap, mysqli, timezonedb), but found ${modules_count}"
+            docker exec librebooking-smoke php -m || true
+            exit 1
+          fi
+
+      -
+        name: Cleanup smoke container
+        if: always()
+        run: |
+          docker rm --force librebooking-smoke >/dev/null 2>&1 || true
+          docker rm --force librebooking-smoke-src >/dev/null 2>&1 || true
+          rm -rf /tmp/librebooking-database_schema