feat: add dev-container (kedacore#784)

.devcontainer/Dockerfile

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+#-------------------------------------------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See https://go.microsoft.com/fwlink/?linkid=2090316 for license information.
+#-------------------------------------------------------------------------------------------------------------
+
+FROM node:18.3.0-slim
+
+# Avoid warnings by switching to noninteractive
+ENV DEBIAN_FRONTEND=noninteractive
+
+# This Dockerfile adds a non-root 'vscode' user with sudo access. However, for Linux,
+# this user's GID/UID must match your local user UID/GID to avoid permission issues
+# with bind mounts. Update USER_UID / USER_GID if yours is not 1000. See
+# https://aka.ms/vscode-remote/containers/non-root-user for details.
+ARG USERNAME=vscode
+ARG USER_UID=1000
+ARG USER_GID=$USER_UID
+
+# Configure apt, install packages and tools
+RUN apt-get update \
+    && apt-get -y install --no-install-recommends apt-utils dialog 2>&1 \
+    #
+    # Verify git, process tools, lsb-release (common in install instructions for CLIs) installed
+    && apt-get -y install git iproute2 procps lsb-release 
+
+    # [Optional] Add sudo support
+RUN apt-get install -y sudo \
+    && echo $USERNAME ALL=\(root\) NOPASSWD:ALL > /etc/sudoers.d/$USERNAME \
+    && chmod 0440 /etc/sudoers.d/$USERNAME
+    #
+    # deps
+RUN apt-get install -y make curl
+    #
+    # Clean up
+RUN apt-get autoremove -y \
+    && apt-get clean -y \
+    && rm -rf /var/lib/apt/lists/*

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/vscode-remote/devcontainer.json or the definition README at
+// https://github.com/microsoft/vscode-dev-containers/tree/master/containers/go
+{
+	"name": "Npm",
+	"dockerFile": "Dockerfile",
+	"runArgs": [
+		// Uncomment the next line to use a non-root user. On Linux, this will prevent
+		// new files getting created as root, but you may need to update the USER_UID
+		// and USER_GID in .devcontainer/Dockerfile to match your user if not 1000.
+		// "-u", "vscode",
+
+		// Cache vscode exentsions installs and homedir
+		"-v", "keda-docs-vscodecache:/root/.vscode-server",
+
+		// Mount docker socket for doecker builds
+		"-v", "/var/run/docker.sock:/var/run/docker.sock",
+
+		"--cap-add=SYS_PTRACE", "--security-opt", "seccomp=unconfined"
+	],
+
+	// Use 'settings' to set *default* container specific settings.json values on container create.
+	// You can edit these settings after create using File > Preferences > Settings > Remote.
+	"settings": {
+		"terminal.integrated.shell.linux": "/bin/bash",
+	},
+
+	// Add the IDs of extensions you want installed when the container is created in the array below.
+	"extensions": [
+	]
+}

.gitattributes

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+# normalize all introduced text files to LF line endings (recognized by git)
+ *           text=auto
+ # additionally declare text file types
+ *.sh        text eol=lf