update github actions to auto-build new images

because of course it doesn't just automatically pick them up, gotta have duplicated hard-coded lists everywhere

god i hate github actions

.github/workflows/main.yml

@@ -24,19 +24,21 @@ jobs:
       fail-fast: false
       matrix:
         component:
-          - downloader
-          - restreamer
           - backfiller
-          - thrimshim
+          - bus_analyzer
+          - buscribe
+          - buscribe_api
+          - chat_archiver
           - cutter
-          - sheetsync
+          - downloader
           - nginx
+          - playlist_manager
           - postgres
+          - restreamer
           - segment_coverage
-          - playlist_manager
-          - chat_archiver
+          - sheetsync
+          - thrimshim
           - zulip_bots
-          - bus_analyzer
     steps:
       - name: Check out repo
         uses: actions/checkout@v2