More updates and learning.

.github/workflows/ci.cue

@@ -21,7 +21,9 @@ jobs: ci: {
 	container: image: "erlang:${{matrix.otp_vsn}}"
 	strategy: matrix: {
 		otp_vsn: OTP_Versions.all
-		// os: ["ubuntu-latest"] // This is somewhat of a lie.
+		// This entry is a lie. The container images are Debian containers, but
+		// one has to specify where those containers are hosted.
+		os: ["ubuntu-latest"]
 	}
 	steps: [
 		{uses: "actions/checkout@v2"},

.github/workflows/ci.yaml

@@ -18,6 +18,8 @@ jobs:
         - 22.3
         - 23.3
         - 24.0
+        os:
+        - ubuntu-latest
     steps:
     - uses: actions/checkout@v2
     - name: Update apt-get database