updates dockerfile to work with latest golang, adds .dockerignore, fixes CI (#4)

* adds support for https://github.com/golang/go/issues/32479

* updated dockerfile to work with latest golang, added .dockerignore

.dockerignore

@@ -0,0 +1 @@
+Dockerfile

Dockerfile

@@ -15,5 +15,5 @@ COPY . /go/src/pastebin
 
 RUN go get -v -d
 RUN go get github.com/GeertJohan/go.rice/rice
-RUN rice embed-go
+RUN GOROOT=/go rice embed-go
 RUN go install -v

server.go

@@ -8,6 +8,7 @@ import (
 	"log"
 	"net/http"
 	"net/url"
+	"strconv"
 	"strings"
 	"time"
 
@@ -19,7 +20,7 @@ import (
 	"github.com/rcrowley/go-metrics/exp"
 	"github.com/thoas/stats"
 
-	"github.com/GeertJohan/go.rice"
+	rice "github.com/GeertJohan/go.rice"
 	"github.com/julienschmidt/httprouter"
 	"github.com/patrickmn/go-cache"
 	"github.com/renstrom/shortuuid"
@@ -160,7 +161,7 @@ func (s *Server) DownloadHandler() httprouter.Handle {
 
 		w.Header().Set("Content-Disposition", "attachment; filename="+uuid)
 		w.Header().Set("Content-Type", "application/octet-stream")
-		w.Header().Set("Content-Length", string(content.Size()))
+		w.Header().Set("Content-Length", strconv.FormatInt(content.Size(), 10))
 
 		http.ServeContent(w, r, uuid, time.Now(), content)
 	}