feat: pre-filter the github cache

Since this is no longer json we rename the cache file
and filter before writing out

Author: philclifford

deb-get

@@ -156,7 +156,7 @@ function follow_url() {
 
 function get_github_releases() {
     METHOD="github"
-    CACHE_FILE="${CACHE_DIR}/${APP}.json"
+    CACHE_FILE="${CACHE_DIR}/${APP}.json_extract"
     # Cache github releases json for 1 hour to try and prevent API rate limits
     #   https://docs.github.com/en/rest/overview/resources-in-the-rest-api#rate-limiting
     #   {"message":"API rate limit exceeded for 62.31.16.154. (But here's the good news: Authenticated requests get a higher rate limit. Check out the documentation for more details.)","documentation_url":"https://docs.github.com/rest/overview/resources-in-the-rest-api#rate-limiting"}
@@ -167,8 +167,8 @@ function get_github_releases() {
         if [ ! -e "${CACHE_FILE}" ] || [ -n "$(find "${CACHE_FILE}" -mmin +"${DEBGET_CACHE_RTN:-60}")" ]; then
             fancy_message info "Updating ${CACHE_FILE}"
             local URL="https://api.github.com/repos/${1}/releases${2:+/$2}"
-            wgetcmdarray=(wget  "${HEADERPARAM}" "${HEADERAUTH}" -q --no-use-server-timestamps "${URL}" -O "${CACHE_FILE}")
-            ${ELEVATE} "${wgetcmdarray[@]}" || ( fancy_message warn "Updating ${CACHE_FILE} failed." )
+            wgetcmdarray=(wget  "${HEADERPARAM}" "${HEADERAUTH}" -q --no-use-server-timestamps "${URL}" -O- )
+            ${ELEVATE} "${wgetcmdarray[@]}" | sed '/browser_download/!d;/\.deb/!d' >  "${CACHE_FILE}" || ( fancy_message warn "Updating ${CACHE_FILE} failed." )
             if [ -f "${CACHE_FILE}" ] && grep "API rate limit exceeded" "${CACHE_FILE}"; then
                 fancy_message warn "Updating ${CACHE_FILE} exceeded GitHub API limits. Deleting it."
                 ${ELEVATE} rm "${CACHE_FILE}" 2>/dev/null
@@ -1372,7 +1372,7 @@ function dg_action_cache() {
 function dg_action_clean() {
         elevate_privs
         ${ELEVATE} rm -fv "${CACHE_DIR}"/*.deb
-        ${ELEVATE} rm -fv "${CACHE_DIR}"/*.json
+        ${ELEVATE} rm -fv "${CACHE_DIR}"/*.json*
         ${ELEVATE} rm -fv "${CACHE_DIR}"/*.html
         ${ELEVATE} rm -fv "${CACHE_DIR}"/*.txt