[BUGFIX] Fix Docker healthcheck script (#1485)

* [MISC] Update Docker healthcheck script

This change now determines the host for Docker healthcheck from the `configuration.yml` that Authelia is started with.

The script has also been run through shellcheck and terminated with a newline in hopes to resolve a number of unreproducible issues.

* Fix healthcheck failing because of CRLF in configuration.yml (#1483)

The configuration.yml might contain CRLF characters. If that's the case, they are included in the results of sed, which breaks the healthcheck, so remove any CR characters in the host/port variables.

Co-authored-by: Berisan <berisan@berisan.dev>

healthcheck.sh

@@ -1,17 +1,22 @@
 #!/bin/sh
 
-AUTHELIA_CONFIG=$(ps | grep authelia | awk '{print $6}' | head -1)
-AUTHELIA_SCHEME=$(cat "${AUTHELIA_CONFIG}" | grep ^tls)
-AUTHELIA_PORT=$(cat "${AUTHELIA_CONFIG}" | grep ^port | sed -e 's/port: //')
+AUTHELIA_CONFIG=$(pgrep -af authelia | awk '{print $4}')
+AUTHELIA_SCHEME=$(grep ^tls "${AUTHELIA_CONFIG}")
+AUTHELIA_HOST=$(grep ^host "${AUTHELIA_CONFIG}" | sed -e 's/host: //' -e 's/\r//')
+AUTHELIA_PORT=$(grep ^port "${AUTHELIA_CONFIG}" | sed -e 's/port: //' -e 's/\r//')
 
-if [[ -z ${AUTHELIA_PORT} ]]; then
-  AUTHELIA_PORT=9091
-fi
-
-if [[ -z ${AUTHELIA_SCHEME} ]]; then
+if [ -z "${AUTHELIA_SCHEME}" ]; then
   AUTHELIA_SCHEME=http
 else
   AUTHELIA_SCHEME=https
 fi
 
-wget --quiet --tries=1 --spider ${AUTHELIA_SCHEME}://localhost:${AUTHELIA_PORT}/api/state || exit 1
+if [ -z "${AUTHELIA_HOST}" ] || [ "${AUTHELIA_HOST}" = "0.0.0.0" ]; then
+  AUTHELIA_HOST=localhost
+fi
+
+if [ -z "${AUTHELIA_PORT}" ]; then
+  AUTHELIA_PORT=9091
+fi
+
+wget --quiet --tries=1 --spider "${AUTHELIA_SCHEME}://${AUTHELIA_HOST}:${AUTHELIA_PORT}/api/state" || exit 1