Pull latest dotnet 6.0-focal image and add Microsoft Signing Keys to avoid expired signature causing deployment failure

.devcontainer/Dockerfile

@@ -1,10 +1,20 @@
 # [Choice] .NET version: 6.0-focal, 7.0-bullseye
-ARG VARIANT="6.0-focal"
-FROM mcr.microsoft.com/devcontainers/dotnet:0-${VARIANT}
+#RUN curl -fsSL https://packages.microsoft.com/keys/microsoft.asc | sudo gpg --dearmor -o /usr/share/keyrings/microsoft-prod.gpg
+
+ARG VARIANT="dev-6.0-focal"
+FROM mcr.microsoft.com/devcontainers/dotnet:${VARIANT}
 
 # Add .NET global tools path
 ENV PATH $PATH:/home/vscode/.dotnet:/home/vscode/.dotnet/tools
 
+# Import Microsoft Signing Keys
+# https://learn.microsoft.com/dotnet/core/install/linux-ubuntu#unable-to-locate--some-packages-could-not-be-installed
+RUN sudo apt-get install -y gpg wget \
+    && wget https://packages.microsoft.com/keys/microsoft.asc \
+    && cat microsoft.asc | gpg --dearmor -o microsoft.asc.gpg \
+    && sudo mv microsoft.asc.gpg /etc/apt/trusted.gpg.d/ \
+    && sudo chown root:root /etc/apt/trusted.gpg.d/microsoft.asc.gpg
+
 # Install additional OS packages
 RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
     && apt-get -y install --no-install-recommends software-properties-common

.devcontainer/docker-compose.yml

@@ -7,7 +7,7 @@ services:
       dockerfile: Dockerfile
       args:
         # Update 'VARIANT' to pick a version of .NET: 6.0-focal, 7.0-bullseye
-        VARIANT: "6.0-focal"
+        VARIANT: "dev-6.0-focal"
 
     volumes:
       - ..:/workspace:cached

.devcontainer/sql/postCreateCommand.sh

@@ -6,6 +6,7 @@ dacpath=$2
 sqlpath=$3
 
 echo "SELECT * FROM SYS.DATABASES" | dd of=testsqlconnection.sql
+
 for i in {1..60};
 do
     sqlcmd -S localhost -U sa -P $SApassword -d master -i testsqlconnection.sql > /dev/null

.gitattributes

@@ -0,0 +1,3 @@
+# Git will always convert line endings to LF on checkout. 
+# Used for files that must keep LF endings, even on Windows.
+*.sh text eol=lf

app/BlazorLibrary/wwwroot/appsettings.json

@@ -1,3 +1,3 @@
 {
-    "ApiUrl": "http://127.0.0.1:5001"
+    "ApiUrl": "http://127.0.0.1:5000"
 }