create a seperate docker file

.devcontainer/Dockerfile

@@ -0,0 +1,40 @@
+FROM kerberos/base:4281f79 AS builder
+LABEL AUTHOR=Kerberos.io
+
+ENV GOROOT=/usr/local/go
+ENV GOPATH=/go
+ENV PATH=$GOPATH/bin:$GOROOT/bin:/usr/local/lib:$PATH
+ENV GOSUMDB=off
+
+##########################################
+# Installing some additional dependencies.
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+	git build-essential cmake pkg-config unzip libgtk2.0-dev \
+	curl ca-certificates libcurl4-openssl-dev libssl-dev \
+	libavcodec-dev libavformat-dev libswscale-dev libtbb2 libtbb-dev \
+	libjpeg-dev libpng-dev libtiff-dev libdc1394-22-dev && \
+	rm -rf /var/lib/apt/lists/*
+
+##############################################################################
+# Copy all the relevant source code in the Docker image, so we can build this.
+
+RUN mkdir -p /go/src/github.com/kerberos-io/agent
+COPY machinery /go/src/github.com/kerberos-io/agent/machinery
+COPY ui /go/src/github.com/kerberos-io/agent/ui
+
+########################
+# Download NPM and Yarns
+
+RUN mkdir /usr/local/nvm
+ENV NVM_DIR /usr/local/nvm
+ENV NODE_VERSION 16.17.0
+RUN curl https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.1/install.sh | bash \
+	&& . $NVM_DIR/nvm.sh \
+	&& nvm install $NODE_VERSION \
+	&& nvm alias default $NODE_VERSION \
+	&& nvm use default
+
+ENV NODE_PATH $NVM_DIR/v$NODE_VERSION/lib/node_modules
+ENV PATH $NVM_DIR/versions/node/v$NODE_VERSION/bin:$PATH
+RUN npm install -g yarn

.devcontainer/devcontainer.json

@@ -1,13 +1,13 @@
 // For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
 // https://github.com/microsoft/vscode-dev-containers/tree/v0.245.2/containers/docker-existing-dockerfile
 {
-	"name": "Existing Dockerfile",
+	"name": "A Dockerfile containing FFmpeg, OpenCV, Go and Yarn",
 
 	// Sets the run context to one level up instead of the .devcontainer folder.
 	"context": "..",
 
 	// Update the 'dockerFile' property if you aren't using the standard 'Dockerfile' filename.
-	"dockerFile": "../Dockerfile"
+	"dockerFile": "./Dockerfile"
 
 	// Use 'forwardPorts' to make a list of ports inside the container available locally.
 	// "forwardPorts": [],