CI: upload build logs as artifacts

Upload the config.log from building ct-ng as well as build.log and
.config from the toolchain builds.

Signed-off-by: Chris Packham <judge.packham@gmail.com>

.github/workflows/continuous-integration-workflow.yml

@@ -28,6 +28,12 @@ jobs:
           ./bootstrap
           ./configure --enable-local
           make
+      - name: "upload config.log"
+        uses: actions/upload-artifact@v2
+        with:
+          name: config.log
+          path: config.log
+        if: ${{ always() }}
       - name: "build ${{ matrix.sample }}"
         run: |
           mkdir -p src
@@ -40,3 +46,11 @@ jobs:
           echo 'CT_LOG_ALL=y' >>.config
           echo 'CT_LOG_LEVEL_MAX="ALL"' >>.config
           ./ct-ng build
+      - name: "upload log"
+        uses: actions/upload-artifact@v2
+        with:
+          name: "${{ matrix.sample }}.log"
+          path: |
+            build.log
+            .config
+        if: ${{ always() }}