Add go 1.15 version to the action (#30)

Signed-off-by: Cosmin Cojocar <ccojocar@cloudbees.com>

Author: Cosmin Cojocar

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.14
+FROM golang:1.15
 
 LABEL name="Golang Action"
 LABEL maintainer="Cedric Kring"

README.md

@@ -64,7 +64,7 @@ steps:
     PROJECT_PATH: "./path/in/my/project"
 ```
 
-To use a specific golang version (1.10, 1.11, 1.12, 1.13, 1.14), defaults to the latest version:
+To use a specific golang version (1.10, 1.11, 1.12, 1.13, 1.14, 1.15), defaults to the latest version:
 ```yaml
 steps:
 - name: Use Go 1.11

go1.15/Dockerfile

@@ -0,0 +1,22 @@
+FROM golang:1.15
+
+LABEL name="Golang Action"
+LABEL maintainer="Cedric Kring"
+LABEL version="1.5.2"
+LABEL repository="https://github.com/cedrickring/golang-action"
+
+LABEL com.github.actions.name="Golang Action"
+LABEL com.github.actions.description="Run Golang commands"
+LABEL com.github.actions.icon="box"
+LABEL com.github.actions.color="blue"
+
+# Install dep and check sha256 checksum matches for version 0.5.4 https://github.com/golang/dep/releases/tag/v0.5.4
+RUN set -eux; \
+  curl -L -s https://github.com/golang/dep/releases/download/v0.5.4/dep-linux-amd64 -o "$GOPATH/bin/dep"; \
+  echo "40a78c13753f482208d3f4bea51244ca60a914341050c588dad1f00b1acc116c $GOPATH/bin/dep" | sha256sum -c -; \
+  chmod +x "${GOPATH}/bin/dep";
+
+COPY entrypoint.sh /entrypoint.sh
+
+ENTRYPOINT ["/entrypoint.sh"]
+CMD [""]

go1.15/entrypoint.sh

@@ -0,0 +1,60 @@
+#!/bin/sh
+
+set -e
+
+if [ -z "${IMPORT}" ]; then
+  IMPORT="${GITHUB_REPOSITORY}"
+fi
+WORKDIR="${GOPATH}/src/github.com/${IMPORT}"
+
+# PROJECT_PATH specifies the subdirectory in the working directory that the Go project is
+if [ -z "${PROJECT_PATH}" ]; then
+  PROJECT_PATH="."
+fi
+
+# Go can only find dependencies if they're under $GOPATH/src.
+# GitHub Actions mounts your repository outside of $GOPATH.
+# So symlink the repository into $GOPATH, and then cd to it.
+mkdir -p "$(dirname "${WORKDIR}")"
+ln -s "${PWD}" "${WORKDIR}"
+cd "${WORKDIR}/${PROJECT_PATH}"
+
+# If a command was specified with `args="..."`, then run it.  Otherwise,
+# look for something useful to run.
+if [ $# -eq 0 ] || [ "$*" = "" ]; then
+  if [ -r Makefile ]; then
+    make
+  else
+    if [ -r go.mod ]; then
+      export GO111MODULE=on
+      # Check if using vendored dependencies
+      if [ -d "vendor" ]; then
+        export GOFLAGS="-mod=vendor"
+      else
+        # Ensure no go.mod changes are made that weren't committed
+        export GOFLAGS="-mod=readonly"
+      fi
+    else
+      if [ -r Gopkg.toml ]; then
+        # Check if using vendored dependencies
+        if [ -d "vendor" ]; then
+          # Check that dep is in sync with /vendor dependencies and that running dep ensure doesn't result in modifications to Gopkg.lock/Gopkg.toml
+          "$GOPATH/bin/dep" ensure && "$GOPATH/bin/dep" check
+          git_workspace_status="$(git status --porcelain)"
+          if [ -n "${git_workspace_status}" ]; then
+            echo "Unexpected changes were found in dep /vendored. Please run $(dep ensure) and commit changes:";
+            echo "${git_workspace_status}";
+            exit 1;
+          fi
+        else
+          # Run dep ensure to download and sync dependencies
+          "$GOPATH/bin/dep" ensure
+        fi
+      fi
+    fi
+    go build ./...
+    go test ./...
+  fi
+else
+  sh -c "$*"
+fi