Support .NET 9.0 (devcontainers#1185)

Author: samruddhikhandale

src/dotnet/.devcontainer/Dockerfile

@@ -1,4 +1,4 @@
-ARG VARIANT=8.0-bookworm-slim
+ARG VARIANT=9.0-bookworm-slim
 FROM mcr.microsoft.com/dotnet/sdk:${VARIANT}
 ENV PATH $PATH:/home/vscode/.dotnet:/home/vscode/.dotnet/tools
 

src/dotnet/README.md

@@ -9,7 +9,7 @@
 | *Categories* | Core, Languages |
 | *Image type* | Dockerfile |
 | *Published images* | mcr.microsoft.com/devcontainers/dotnet |
-| *Available image variants* | 8.0 /8.0-bookworm, 8.0-noble, 8.0-jammy, 6.0 /6.0-bookworm, 6.0-bullseye, 6.0-jammy, 6.0-focal ([full list](https://mcr.microsoft.com/v2/devcontainers/dotnet/tags/list)) |
+| *Available image variants* | 9.0 /9.0-bookworm, 8.0 /8.0-bookworm, 9.0-jammy, 8.0-jammy, 8.0-noble, 6.0 /6.0-bookworm, 6.0-bullseye, 6.0-jammy, 6.0-focal ([full list](https://mcr.microsoft.com/v2/devcontainers/dotnet/tags/list)) |
 | *Published image architecture(s)* | x86-64, arm64/aarch64 for `bookworm`, `bullseye`, `noble`, `jammy` variants |
 | *Container host OS support* | Linux, macOS, Windows |
 | *Container OS* | Ubuntu (`-focal`, `-jammy`, `-noble`), Debian (`-bullseye`, `-bookworm`) |
@@ -22,6 +22,7 @@ See **[history](history)** for information on the contents of published images.
 You can directly reference pre-built versions of `Dockerfile` by using the `image` property in `.devcontainer/devcontainer.json` or updating the `FROM` statement in your own  `Dockerfile` to one of the following. An example `Dockerfile` is included in this repository.
 
 - `mcr.microsoft.com/devcontainers/dotnet` (latest)
+- `mcr.microsoft.com/devcontainers/dotnet:9.0` (or `9.0-bookworm`, `9.0-noble` to pin to an OS version)
 - `mcr.microsoft.com/devcontainers/dotnet:8.0` (or `8.0-bookworm`, `8.0-noble`, `8.0-jammy` to pin to an OS version)
 - `mcr.microsoft.com/devcontainers/dotnet:6.0` (or `6.0-bookworm`, `6.0-bullseye`, `6.0-jammy`, `6.0-focal` to pin to an OS version)
 
@@ -30,9 +31,9 @@ Refer to [this guide](https://containers.dev/guide/dockerfile) for more details.
 
 You can decide how often you want updates by referencing a [semantic version](https://semver.org/) of each image. For example:
 
-- `mcr.microsoft.com/devcontainers/dotnet:1-8.0`
-- `mcr.microsoft.com/devcontainers/dotnet:1.0-8.0`
-- `mcr.microsoft.com/devcontainers/dotnet:1.0.0-8.0`
+- `mcr.microsoft.com/devcontainers/dotnet:1-9.0`
+- `mcr.microsoft.com/devcontainers/dotnet:1.3-9.0`
+- `mcr.microsoft.com/devcontainers/dotnet:1.3.0-9.0`
 
 See [history](history) for information on the contents of each version and [here for a complete list of available tags](https://mcr.microsoft.com/v2/devcontainers/dotnet/tags/list).
 

src/dotnet/manifest.json

@@ -1,6 +1,8 @@
 {
 	"version": "1.2.1",
 	"variants": [
+		"9.0-bookworm-slim",
+		"9.0-noble",
 		"8.0-bookworm-slim",
 		"8.0-noble",
 		"8.0-jammy",
@@ -10,12 +12,20 @@
 		"6.0-focal"
 	],
 	"build": {
-		"latest": "8.0-bookworm-slim",
+		"latest": "9.0-bookworm-slim",
 		"rootDistro": "debian",
 		"tags": [
 			"dotnet:${VERSION}-${VARIANT}"
 		],
 		"architectures": {
+			"9.0-bookworm-slim": [
+				"linux/amd64",
+				"linux/arm64"
+			],
+			"9.0-noble": [
+				"linux/amd64",
+				"linux/arm64"
+			],
 			"8.0-bookworm-slim": [
 				"linux/amd64",
 				"linux/arm64"