fix build boilerplate (not in Bintray anymore)

.github/workflows/build.yml

@@ -8,11 +8,9 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - name: Download Turbo Bob
-      run: curl --fail --location --output bob https://dl.bintray.com/function61/dl/turbobob/20200101_1536_caf624e6/bob_linux-amd64 && chmod +x bob
-    - name: Build with Turbo Bob
-      run: CI_REVISION_ID="$GITHUB_SHA" ./bob build --publish-artefacts
-      # unfortunately there doesn't seem to be a way to "expose all secrets", so you must
-      # list here each secret to pass on to the build
+    - name: Build
+      run: |
+        curl --fail --location --silent --output bob https://function61.com/go/turbobob-latest-stable-linux-amd64 && chmod +x bob
+        ./bob build in-ci-autodetect-settings
       env:
         DOCKER_CREDS: ${{ secrets.DOCKER_CREDS }}