reduce image size (#195)

- make timelapse load on demand
- delete /var/cache/* to save some size on apt related stuff mostly

Dockerfile

@@ -84,14 +84,6 @@ RUN set -x && \
     rm -rf "${TAR1090_UPDATE_DIR}" && \
     # tar1090: add nginx config
     cp -Rv /etc/nginx.tar1090/* /etc/nginx/ && \
-    # timelapse1090
-    git clone --single-branch --depth 1 "https://github.com/wiedehopf/timelapse1090.git" "${GITPATH_TIMELAPSE1090}" && \
-    pushd "${GITPATH_TIMELAPSE1090}" && \
-    bash -ec 'echo "timelapse1090 $(git log | head -1 | tr -s " " "_")" >> /VERSIONS' && \
-    # remove unused .git dir to slightly reduce image size
-    rm -rf "${GITPATH_TIMELAPSE1090}/.git" && \
-    popd && \
-    mkdir -p /var/timelapse1090 && \
     # aircraft-db, file in TAR1090_UPDATE_DIR will be preferred when starting readsb if tar1090-update enabled
     curl -o "${TAR1090_INSTALL_DIR}/aircraft.csv.gz" "https://raw.githubusercontent.com/wiedehopf/tar1090-db/csv/aircraft.csv.gz" && \
     # clone graphs1090 repo
@@ -171,7 +163,7 @@ RUN set -x && \
     apt-get remove -y ${TEMP_PACKAGES[@]} && \
     apt-get autoremove -y && \
     apt-get clean -q -y && \
-    rm -rf /src/* /tmp/* /var/lib/apt/lists/* && \
+    rm -rf /src/* /tmp/* /var/lib/apt/lists/* /var/cache/* && \
     # document versions
     bash -ec 'grep -v tar1090-db /VERSIONS | grep tar1090 | cut -d " " -f 2 > /CONTAINER_VERSION' && \
     cat /VERSIONS && \

rootfs/etc/s6-overlay/startup.d/11-timelapse1090

@@ -0,0 +1,16 @@
+#!/command/with-contenv bash
+# shellcheck shell=bash disable=SC1091,SC2015,SC2153
+
+source /scripts/common
+
+if ! chk_enabled "${ENABLE_TIMELAPSE1090}" || chk_enabled "${TAR1090_DISABLE}"; then
+    exit 0
+fi
+
+if [[ -d "${GITPATH_TIMELAPSE1090}" ]]; then
+    exit 0
+fi
+
+# timelapse1090
+git clone --single-branch --depth 1 "https://github.com/wiedehopf/timelapse1090.git" "${GITPATH_TIMELAPSE1090}"
+mkdir -p /var/timelapse1090