introduce a config file to logstation

Still work to process and use the parameters in the config file but this is a start!

go.mod

@@ -8,23 +8,38 @@ require (
 	github.com/gorilla/websocket v1.5.0
 	github.com/labstack/echo/v4 v4.3.0
 	github.com/sirupsen/logrus v1.8.1
+	github.com/spf13/viper v1.12.0
 )
 
 require (
 	github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc // indirect
 	github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf // indirect
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible // indirect
+	github.com/fsnotify/fsnotify v1.5.4 // indirect
+	github.com/hashicorp/hcl v1.0.0 // indirect
 	github.com/labstack/gommon v0.3.0 // indirect
-	github.com/mattn/go-colorable v0.1.8 // indirect
-	github.com/mattn/go-isatty v0.0.12 // indirect
+	github.com/magiconair/properties v1.8.6 // indirect
+	github.com/mattn/go-colorable v0.1.12 // indirect
+	github.com/mattn/go-isatty v0.0.14 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/pelletier/go-toml v1.9.5 // indirect
+	github.com/pelletier/go-toml/v2 v2.0.1 // indirect
 	github.com/prometheus/common v0.0.0-20181126121408-4724e9255275 // indirect
+	github.com/spf13/afero v1.8.2 // indirect
+	github.com/spf13/cast v1.5.0 // indirect
+	github.com/spf13/jwalterweatherman v1.1.0 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/subosito/gotenv v1.3.0 // indirect
 	github.com/valyala/bytebufferpool v1.0.0 // indirect
 	github.com/valyala/fasttemplate v1.2.1 // indirect
-	golang.org/x/crypto v0.0.0-20210322153248-0c34fe9e7dc2 // indirect
-	golang.org/x/exp v0.0.0-20190121172915-509febef88a4 // indirect
-	golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4 // indirect
-	golang.org/x/sys v0.0.0-20210403161142-5e06dd20ab57 // indirect
-	golang.org/x/text v0.3.6 // indirect
+	golang.org/x/crypto v0.0.0-20220411220226-7b82a4e95df4 // indirect
+	golang.org/x/exp v0.0.0-20200224162631-6cc2880d07d6 // indirect
+	golang.org/x/net v0.0.0-20220520000938-2e3eb7b945c2 // indirect
+	golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a // indirect
+	golang.org/x/text v0.3.7 // indirect
 	golang.org/x/time v0.0.0-20201208040808-7e3f01d25324 // indirect
 	gopkg.in/alecthomas/kingpin.v2 v2.2.6 // indirect
+	gopkg.in/ini.v1 v1.66.4 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+	gopkg.in/yaml.v3 v3.0.0 // indirect
 )