Export build artifacts for .deb packages

This attempts to use shrink/actions-docker-extract and
actions/upload-artifact to take the completed .deb and .changes files
out of a container that has terminated, then upload them as build
artifacts.

.github/workflows/build-apache-latest.yml

@@ -31,3 +31,44 @@ jobs:
           push: true
           tags: 'ghcr.io/mlibrary/lauth/lauth-apache:${{ github.sha }}, ghcr.io/mlibrary/lauth/lauth-apache:latest'
           file: ./apache/Dockerfile
+
+      - name: Build .deb packages
+        uses: docker/build-push-action@v5
+        with:
+          context: ./
+          target: packages
+          push: false
+          load: true
+          tags: 'lauth-debs:latest'
+          file: ./apache/Dockerfile
+
+      - uses: shrink/actions-docker-extract@v3
+        id: extract
+        with:
+          image: lauth-debs:latest
+          path: /debs/out/.
+          destination: dist
+
+      - name: Archive http-check .deb package
+        uses: actions/upload-artifact@v4
+        with:
+          name: http-check
+          path: dist/http-check*.deb
+
+      - name: Archive mod-authn-remoteuser .deb package
+        uses: actions/upload-artifact@v4
+        with:
+          name: mod-authn-remoteuser
+          path: dist/libapache2-mod-authn-remoteuser*.deb
+
+      - name: Archive mod-lauth .deb package
+        uses: actions/upload-artifact@v4
+        with:
+          name: mod-authn-remoteuser
+          path: dist/libapache2-mod-lauth*.deb
+
+      - name: Archive .changes files
+        uses: actions/upload-artifact@v4
+        with:
+          name: mod-authn-remoteuser
+          path: dist/*.changes