Update extension recommendations

Author: Quasar6X

.devcontainer/devcontainer.json

@@ -6,6 +6,7 @@
         "vscode": {
             "extensions": [
                 "exiasr.hadolint",
+                "github.vscode-github-actions",
                 "james-yu.latex-workshop",
                 "ms-azuretools.vscode-containers",
                 "ms-vscode.makefile-tools",

.vscode/extensions.json

@@ -0,0 +1,12 @@
+{
+    "recommendations": [
+        "exiasr.hadolint",
+        "github.vscode-github-actions",
+        "james-yu.latex-workshop",
+        "ms-azuretools.vscode-containers",
+        "ms-vscode.makefile-tools",
+        "ms-vscode-remote.remote-containers",
+        "redhat.vscode-yaml",
+        "timonwong.shellcheck"
+    ]
+}