Generate a local certificate for Kestrel https

Fixes #10981

.devcontainer/Dockerfile

@@ -42,4 +42,8 @@ RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
 # Needing to set unsafe-perm as root is the user setup
 # https://docs.npmjs.com/cli/v6/using-npm/config#unsafe-perm
 # Default: false if running as root, true otherwise (we are ROOT)
-RUN npm -g config set user vscode && npm -g config set unsafe-perm
+RUN npm -g config set user vscode && npm -g config set unsafe-perm
+
+# Generate and trust a local developer certificate for Kestrel
+# This is needed for Kestrel to bind on https
+RUN dotnet dev-certs https --trust