fix: second round audit - backup paths, cleanup, dead code

CT scripts:
- ct/hoodik.sh: backup to /opt instead of /tmp
- ct/pixelfed.sh: backup to /opt, add CLEAN_INSTALL=1
- ct/skylite-ux.sh: backup to /opt instead of /tmp

Install scripts:
- install/alpine-install.sh: add missing cleanup_lxc
- install/ubuntu-install.sh: replace manual apt-get cleanup with cleanup_lxc
- install/debian-install.sh: apt-get -> apt
- install/hoodik-install.sh: remove 40 lines of dead commented code
- install/step-ca-install.sh: remove  from export builtins

ct/hoodik.sh

@@ -36,7 +36,7 @@ function update_script() {
     msg_ok "Stopped Services"
 
     msg_info "Backing up Configuration"
-    cp /opt/hoodik/.env /tmp/hoodik.env.bak
+    cp /opt/hoodik/.env /opt/hoodik.env.bak
     msg_ok "Backed up Configuration"
 
     msg_info "Updating Hoodik (Patience - this takes 15-20 minutes)"
@@ -58,8 +58,8 @@ function update_script() {
     msg_ok "Updated Hoodik"
 
     msg_info "Restoring Configuration"
-    cp /tmp/hoodik.env.bak /opt/hoodik/.env
-    rm -f /tmp/hoodik.env.bak
+    cp /opt/hoodik.env.bak /opt/hoodik/.env
+    rm -f /opt/hoodik.env.bak
     msg_ok "Restored Configuration"
 
     msg_info "Cleaning Up"

ct/pixelfed.sh

@@ -36,14 +36,14 @@ function update_script() {
     msg_ok "Services stopped"
 
     msg_info "Backing up Configuration"
-    cp /opt/pixelfed/.env /tmp/pixelfed.env.bak
+    cp /opt/pixelfed/.env /opt/pixelfed.env.bak
     msg_ok "Configuration backed up"
 
-    fetch_and_deploy_gh_release "pixelfed" "pixelfed/pixelfed" "tarball" "latest" "/opt/pixelfed"
+    CLEAN_INSTALL=1 fetch_and_deploy_gh_release "pixelfed" "pixelfed/pixelfed" "tarball" "latest" "/opt/pixelfed"
 
     msg_info "Restoring Configuration"
-    cp /tmp/pixelfed.env.bak /opt/pixelfed/.env
-    rm -f /tmp/pixelfed.env.bak
+    cp /opt/pixelfed.env.bak /opt/pixelfed/.env
+    rm -f /opt/pixelfed.env.bak
     msg_ok "Configuration restored"
 
     msg_info "Updating Pixelfed"

ct/skylite-ux.sh

@@ -36,14 +36,14 @@ function update_script() {
     msg_ok "Stopped Service"
 
     msg_info "Backing up Data"
-    cp /opt/skylite-ux/.env /tmp/skylite-ux.env.backup
+    cp /opt/skylite-ux/.env /opt/skylite-ux.env.bak
     msg_ok "Backed up Data"
 
     CLEAN_INSTALL=1 fetch_and_deploy_gh_release "skylite-ux" "Wetzel402/Skylite-UX" "tarball"
 
     msg_info "Restoring Data"
-    cp /tmp/skylite-ux.env.backup /opt/skylite-ux/.env
-    rm -f /tmp/skylite-ux.env.backup
+    cp /opt/skylite-ux.env.bak /opt/skylite-ux/.env
+    rm -f /opt/skylite-ux.env.bak
     msg_ok "Restored Data"
 
     msg_info "Building Skylite-UX"