added working obsidian workspace with basic documentation

dockerfile-kasm-obsidian

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+ARG BASE_TAG="develop"
+ARG BASE_IMAGE="core-ubuntu-focal"
+FROM kasmweb/$BASE_IMAGE:$BASE_TAG
+USER root
+
+ENV HOME /home/kasm-default-profile
+ENV STARTUPDIR /dockerstartup
+ENV INST_SCRIPTS $STARTUPDIR/install
+WORKDIR $HOME
+
+######### Customize Container Here ###########
+
+
+COPY ./src/ubuntu/install/obsidian $INST_SCRIPTS/obsidian/
+RUN bash $INST_SCRIPTS/obsidian/install_obsidian.sh  && rm -rf $INST_SCRIPTS/obsidian/
+
+COPY ./src/ubuntu/install/obsidian/custom_startup.sh $STARTUPDIR/custom_startup.sh
+RUN chmod +x $STARTUPDIR/custom_startup.sh
+RUN chmod 755 $STARTUPDIR/custom_startup.sh
+
+
+# Update the desktop environment to be optimized for a single application
+RUN cp $HOME/.config/xfce4/xfconf/single-application-xfce-perchannel-xml/* $HOME/.config/xfce4/xfconf/xfce-perchannel-xml/
+RUN cp /usr/share/extra/backgrounds/bg_kasm.png /usr/share/extra/backgrounds/bg_default.png
+RUN apt-get remove -y xfce4-panel
+
+######### End Customizations ###########
+
+RUN chown 1000:0 $HOME
+
+ENV HOME /home/kasm-user
+WORKDIR $HOME
+RUN mkdir -p $HOME && chown -R 1000:0 $HOME
+
+USER 1000

docs/obsidian/README.md

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+# About This Image
+
+This Image contains a browser-accessible version of [Obsidian.md](https://obsidian.md/).
+
+![Screenshot][Image_Screenshot]
+
+[Image_Screenshot]: https://link.storjshare.io/jvehliqkyvoxtgdzzvehrxu2dnxq/readme-photos%2Fkasmweb%2Fkasmweb-obsidian-example.png?view=1 "Image Screenshot"
+
+# Environment Variables
+
+* `APP_ARGS` - Additional arguments to pass to the application when launched.

docs/obsidian/demo.txt

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+# Live Demo
+
+<a href="" target="_blank"><img src="" width="640" height="360"></a>
+
+**Launch a real-time demo in a new browser window:** <a href="" target="_blank">Live Demo</a>.
+
+<a href="" target="_blank"><img src="https://link.storjshare.io/jx6gv37i63qy6dkntovoxsaj4j2q/readme-photos%2Fkasmweb%2Fobsidian.ico?view=1" width="300" height="104"></a>
+
+&lowast;*Note: Demo is limited to 3 minutes and has upload/downloads restricted for security purposes.*

docs/obsidian/description.txt

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+Obsidian for Kasm Workspaces

src/ubuntu/install/obsidian/custom_startup.sh

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+#!/usr/bin/env bash
+set -ex
+START_COMMAND="obsidian"
+PGREP="obsidian"
+export MAXIMIZE="true"
+export MAXIMIZE_NAME="Obsidian"
+MAXIMIZE_SCRIPT=$STARTUPDIR/maximize_window.sh
+DEFAULT_ARGS="--no-sandbox"
+ARGS=${APP_ARGS:-$DEFAULT_ARGS}
+
+options=$(getopt -o gau: -l go,assign,url: -n "$0" -- "$@") || exit
+eval set -- "$options"
+
+while [[ $1 != -- ]]; do
+    case $1 in
+        -g|--go) GO='true'; shift 1;;
+        -a|--assign) ASSIGN='true'; shift 1;;
+        -u|--url) OPT_URL=$2; shift 2;;
+        *) echo "bad option: $1" >&2; exit 1;;
+    esac
+done
+shift
+
+# Process non-option arguments.
+for arg; do
+    echo "arg! $arg"
+done
+
+FORCE=$2
+
+kasm_exec() {
+    if [ -n "$OPT_URL" ] ; then
+        URL=$OPT_URL
+    elif [ -n "$1" ] ; then
+        URL=$1
+    fi 
+
+    # Since we are execing into a container that already has the browser running from startup, 
+    #  when we don't have a URL to open we want to do nothing. Otherwise a second browser instance would open. 
+    if [ -n "$URL" ] ; then
+        /usr/bin/filter_ready
+        /usr/bin/desktop_ready
+        bash ${MAXIMIZE_SCRIPT} &
+        $START_COMMAND $ARGS $OPT_URL
+    else
+        echo "No URL specified for exec command. Doing nothing."
+    fi
+}
+
+kasm_startup() {
+    if [ -n "$KASM_URL" ] ; then
+        URL=$KASM_URL
+    elif [ -z "$URL" ] ; then
+        URL=$LAUNCH_URL
+    fi
+
+    if [ -z "$DISABLE_CUSTOM_STARTUP" ] ||  [ -n "$FORCE" ] ; then
+
+        echo "Entering process startup loop"
+        set +x
+        while true
+        do
+            if ! pgrep -x $PGREP > /dev/null
+            then
+                /usr/bin/filter_ready
+                /usr/bin/desktop_ready
+                set +e
+                bash ${MAXIMIZE_SCRIPT} &
+                $START_COMMAND $ARGS $URL
+                set -e
+            fi
+            sleep 1
+        done
+        set -x
+
+    fi
+
+} 
+
+if [ -n "$GO" ] || [ -n "$ASSIGN" ] ; then
+    kasm_exec
+else
+    kasm_startup
+fi

src/ubuntu/install/obsidian/install_obsidian.sh

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+#!/usr/bin/env bash
+set -ex
+wget -q "https://github.com/obsidianmd/obsidian-releases/releases/download/v1.4.5/obsidian_1.4.5_amd64.deb" -O obsidian.deb
+apt-get update
+apt-get install -y ./obsidian.deb
+rm  -f obsidian.deb
+
+sed -i "s#Exec=/opt/Obsidian/obsidian#Exec=/opt/Obsidian/obsidian --no-sandbox#g"  /usr/share/applications/obsidian.desktop
+cp /usr/share/applications/obsidian.desktop $HOME/Desktop
+chmod +x $HOME/Desktop/obsidian.desktop
+chown 1000:1000 $HOME/Desktop/obsidian.desktop