Add support for swarm file based secrets

Signed-off-by: Thibault Jamet <tjamet@users.noreply.github.com>

README.md

@@ -121,6 +121,8 @@ The following environment variables are supported. You can pass environment vari
 |--------------------------|---------------|
 |`SUMO_ACCESS_ID`            |Passes the Access ID.|
 |`SUMO_ACCESS_KEY`           |Passes the Access Key.|
+|`SUMO_ACCESS_ID_FILE`       |Passes a bound file path containing Access ID.|
+|`SUMO_ACCESS_KEY_FILE`      |Passes a bound file path containing Access Key.|
 |`SUMO_CLOBBER`              | When true, if there is an existing collector with the same name, that collector will be deleted.<br><br>Default: false|
 |`SUMO_COLLECTOR_NAME`       |Configures the name of the collector. The default is set dynamically to the value in `/etc/hostname`.|
 |`SUMO_COLLECTOR_NAME_PREFIX`|Configures a prefix to the collector name. Useful when overriding `SUMO_COLLECTOR_NAME` with the Docker hostname.<br><br>Default: "collector_container-"<br><br>If you do not want a prefix, set the variable as follows: <br><br>`SUMO_COLLECTOR_NAME_PREFIX = ""`|

run.sh

@@ -1,5 +1,15 @@
 #!/bin/bash
 
+
+if [[ $SUMO_ACCESS_ID_FILE ]]; then
+  export SUMO_ACCESS_ID=$(cat $SUMO_ACCESS_ID_FILE)
+fi
+
+if [[ $SUMO_ACCESS_KEY_FILE ]]; then
+  export SUMO_ACCESS_KEY=$(cat $SUMO_ACCESS_KEY_FILE)
+fi
+
+
 SUMO_GENERATE_USER_PROPERTIES=${SUMO_GENERATE_USER_PROPERTIES:=true}
 SUMO_ACCESS_ID=${SUMO_ACCESS_ID:=$1}
 SUMO_ACCESS_KEY=${SUMO_ACCESS_KEY:=$2}
@@ -11,7 +21,8 @@ SUMO_SYNC_SOURCES=${SUMO_SYNC_SOURCES:=false}
 generate_user_properties_file() {
     if [ -z "$SUMO_ACCESS_ID" ] || [ -z "$SUMO_ACCESS_KEY" ]; then
       echo "FATAL: Please provide credentials, either via the SUMO_ACCESS_ID and SUMO_ACCESS_KEY environment variables,"
-      echo "       or as the first two command line arguments!"
+      echo "       as the first two command line arguments,"
+      echo "       or in files references by SUMO_ACCESS_ID_FILE and SUMO_ACCESS_KEY_FILE!"
       exit 1
     fi