feat(devcontainer): add Hadolint and GitHub CLI features

* Introduced `ghcr.io/dhoeric/features/hadolint:1` for Dockerfile linting.
* Updated VSCode extensions recommendations to include Hadolint and additional tools.
* Created a new `.hadolint.yml` configuration file to ignore specific linting rules.

.devcontainer/devcontainer.json

@@ -9,7 +9,8 @@
     "ghcr.io/devcontainers-extra/features/shellcheck:1": {},
     "ghcr.io/devcontainers-extra/features/yamllint:2": {},
     "ghcr.io/devcontainers/features/docker-outside-of-docker:1": {},
-    "ghcr.io/devcontainers/features/github-cli:1": {}
+    "ghcr.io/devcontainers/features/github-cli:1": {},
+    "ghcr.io/dhoeric/features/hadolint:1": {}
   },
   "customizations": {
     "vscode": {
@@ -17,6 +18,7 @@
         "DavidAnson.vscode-markdownlint",
         "editorconfig.editorconfig",
         "esbenp.prettier-vscode",
+        "exiasr.hadolint",
         "github.vscode-github-actions",
         "GitHub.vscode-pull-request-github",
         "ms-azuretools.vscode-containers",

.hadolint.yml

@@ -0,0 +1,2 @@
+ignored:
+  - DL3008 # Pin versions in apt-get install

.vscode/extensions.json

@@ -1,7 +1,13 @@
 {
   "recommendations": [
+    "DavidAnson.vscode-markdownlint",
     "editorconfig.editorconfig",
     "esbenp.prettier-vscode",
-    "github.vscode-github-actions"
+    "exiasr.hadolint",
+    "github.vscode-github-actions",
+    "GitHub.vscode-pull-request-github",
+    "ms-azuretools.vscode-containers",
+    "redhat.vscode-yaml",
+    "yzhang.markdown-all-in-one"
   ]
 }