ci: Update Docker image to Go 1.13

- The Go version now matches the one used for the GHA CI jobs - The Docker builds failed because a dependency changed and Go 1.12 was not able to use the version from go.sum (see https://hub.docker.com/repository/registry-1.docker.io/tusproject/tusd/builds/913de821-d650-454b-9f05-107862caedf3)
tus · May 16, 2021 · d560c4e · d560c4e
1 parent f1b1830
commit d560c4e
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/Dockerfile b/Dockerfile
@@ -1,4 +1,4 @@
-FROM golang:1.12-alpine AS builder
+FROM golang:1.13-alpine AS builder
 
 # Copy in the git repo from the build context
 COPY . /go/src/github.com/tus/tusd/