remove lastboot before supervisor startup (#1065)

* Add devcontainer (generic add-on devcontainer also available at https://github.com/issacg/hassio-addon-devcontainer)

* remove example code (https://github.com/home-assistant/hassio-addons/pull/1040#discussion_r374373037)

* Run start_hassio.sh from inside .devcontainer (https://github.com/home-assistant/hassio-addons/pull/1040#discussion_r374373323)

* Revert "Fix HA container"

This reverts commit 7062117d46.

* Fix lastboot

.devcontainer/Dockerfile

@@ -19,6 +19,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
         software-properties-common \
         gpg-agent \
         git \
+        jq \
         sudo \
     && curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add - \
     && add-apt-repository "deb https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" \

.devcontainer/start_hassio.sh

@@ -68,10 +68,14 @@ function cleanup_hass_data() {
 function cleanup_docker() {
     echo "Cleaning up stopped containers..."
     docker rm $(docker ps -a -q)
+}
 
-    # Clean homeassistant instance
-    if docker rm -f homeassistant 2> /dev/null; then
-        echo "Cleanup HomeAssistant instance"
+function cleanup_lastboot() {
+    if [[ -f /workspaces/test_hassio/config.json ]]; then
+        echo "Cleaning up last boot"
+        cp /workspaces/test_hassio/config.json /tmp/config.json
+        jq -rM 'del(.last_boot)' /tmp/config.json > /workspaces/test_hassio/config.json
+        rm /tmp/config.json
     fi
 }
 
@@ -102,6 +106,7 @@ case "$1" in
         start_docker
         trap "stop_docker" ERR
         cleanup_docker || true
+        cleanup_lastboot || true
         install
         run_supervisor
         stop_docker;;