chore: adds Gitpod Flex support

.devcontainer/Dockerfile

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+# Use a base image with Ubuntu
+FROM mcr.microsoft.com/vscode/devcontainers/base:ubuntu
+
+# Copy package.json to the container
+COPY package.json /tmp/package.json
+
+# Install necessary packages
+RUN apt-get update && apt-get install -y \
+    apt-transport-https \
+    build-essential \
+    ca-certificates \
+    curl \
+    git \
+    jq \
+    libssl-dev && \
+    rm -rf /var/lib/apt/lists/*
+
+# Extract Node.js version from package.json
+RUN NODE_VERSION=$(jq -r '.engines.node' /tmp/package.json) && \
+    echo "Node version from package.json: $NODE_VERSION"
+
+# Install Node.js and npm
+RUN curl -fsSL https://deb.nodesource.com/setup_22.x | bash - && \
+    apt-get install -y nodejs
+
+# Install Deno
+RUN curl -fsSL https://deno.land/install.sh | sh && \
+    echo 'export PATH="$HOME/.deno/bin:$PATH"' >> /etc/bash.bashrc
+
+# Install NVM and set Node version
+ENV NVM_DIR=/root/.nvm
+RUN curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.4/install.sh | bash && \
+    . $NVM_DIR/nvm.sh && \
+    NODE_VERSION=$(jq -r '.engines.node' /tmp/package.json) && \
+    nvm install $NODE_VERSION && \
+    nvm use $NODE_VERSION && \
+    nvm alias default $NODE_VERSION && \
+    echo 'export NVM_DIR="$NVM_DIR"' >> /etc/bash.bashrc && \
+    echo '[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"' >> /etc/bash.bashrc && \
+    echo 'export PATH="$NVM_DIR/versions/node/v$NODE_VERSION/bin:$PATH"' >> /etc/bash.bashrc
+
+# Install Yarn globally
+RUN npm install -g yarn
+
+# Install Meteor
+RUN curl https://install.meteor.com/?release=$(curl -so- https://raw.githubusercontent.com/RocketChat/Rocket.Chat/develop/apps/meteor/.meteor/release | cut -d@ -f2) | sh && \
+    echo 'export PATH=$PATH:/home/gitpod/.meteor' >> /etc/bash.bashrc
+
+# Set the working directory to ensure permissions are correct
+WORKDIR /workspaces/Rocket.Chat
+
+# Install dependencies
+RUN yarn

.devcontainer/devcontainer.json

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+{
+	"name": "Rocket.Chat Gitpod",
+	"build": {
+        "context": "..",
+        "dockerfile": "./Dockerfile"
+    },
+	"features": {
+        "ghcr.io/devcontainers/features/docker-in-docker:2": {}
+    },
+	"forwardPorts": [3000],
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"esbenp.prettier-vscode"
+			]
+		}
+	}
+}

.gitpod/automations.yaml

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+services:
+  development-server:
+    name: Rocket.Chat development server
+    description: Starts the Rocket.Chat development server
+    triggeredBy:
+      - postDevcontainerStart
+      - manual
+    commands:
+      start: |
+        nvm use $(jq -r '.engines.node' package.json) && \
+        yarn dsv