fix: all envs allowed on build template (#992)

internal/tmpl/tmpl.go

@@ -3,6 +3,7 @@ package tmpl
 
 import (
 	"bytes"
+	"strings"
 	"text/template"
 	"time"
 
@@ -63,6 +64,23 @@ func New(ctx *context.Context) *Template {
 	}
 }
 
+// WithEnvS overrides template's env field with the given KEY=VALUE list of
+// environment variables
+func (t *Template) WithEnvS(envs []string) *Template {
+	var result = map[string]string{}
+	for _, env := range envs {
+		var parts = strings.SplitN(env, "=", 2)
+		result[parts[0]] = parts[1]
+	}
+	return t.WithEnv(result)
+}
+
+// WithEnv overrides template's env field with the given environment map
+func (t *Template) WithEnv(e map[string]string) *Template {
+	t.fields[env] = e
+	return t
+}
+
 // WithArtifact populates fields from the artifact and replacements
 func (t *Template) WithArtifact(a artifact.Artifact, replacements map[string]string) *Template {
 	var bin = a.Extra[binary]

internal/tmpl/tmpl_test.go

@@ -113,6 +113,20 @@ func TestEnv(t *testing.T) {
 	}
 }
 
+func TestWithEnv(t *testing.T) {
+	var ctx = context.New(config.Project{})
+	ctx.Env = map[string]string{
+		"FOO": "BAR",
+	}
+	ctx.Git.CurrentTag = "v1.2.3"
+	out, err := New(ctx).WithEnvS([]string{
+		"FOO=foo",
+		"BAR=bar",
+	}).Apply("{{ .Env.FOO }}-{{ .Env.BAR }}")
+	assert.NoError(t, err)
+	assert.Equal(t, "foo-bar", out)
+}
+
 func TestFuncMap(t *testing.T) {
 	var ctx = context.New(config.Project{
 		ProjectName: "proj",