feat(action): add functions to help with passing env vars into container

Signed-off-by: AtomicFS <[email protected]>

action/environment/environment.go

@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: MIT
+
+// Package environment for is interacting with environment variables
+package environment
+
+import (
+	"os"
+)
+
+// FetchEnvVars when provided with list of environment variables is to
+// return a map of variables and values for those that exist in the environment
+func FetchEnvVars(variables []string) map[string]string {
+	result := make(map[string]string)
+
+	for _, variable := range variables {
+		value, exists := os.LookupEnv(variable)
+		if exists {
+			result[variable] = value
+		}
+	}
+
+	return result
+}

action/environment/environment_test.go

@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: MIT
+
+// Package environment
+package environment
+
+import (
+	"fmt"
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestValidateConfig(t *testing.T) {
+	testCases := []struct {
+		name              string
+		envCreate         map[string]string
+		envSearchFor      []string
+		envExpectedResult map[string]string
+	}{
+		{
+			name:              "no env vars created, no found",
+			envCreate:         map[string]string{},
+			envSearchFor:      []string{"MY_VAR"},
+			envExpectedResult: map[string]string{},
+		},
+		{
+			name: "one created, one found",
+			envCreate: map[string]string{
+				"MY_VAR": "my_val",
+			},
+			envSearchFor: []string{"MY_VAR"},
+			envExpectedResult: map[string]string{
+				"MY_VAR": "my_val",
+			},
+		},
+		{
+			name: "some created, some found",
+			envCreate: map[string]string{
+				"MY_VAR":  "my_val",
+				"MY_VAR2": "my_val2",
+			},
+			envSearchFor: []string{"MY_VAR"},
+			envExpectedResult: map[string]string{
+				"MY_VAR": "my_val",
+			},
+		},
+	}
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			for key, value := range tc.envCreate {
+				os.Setenv(key, value)
+				defer os.Unsetenv(key)
+				fmt.Printf("Setting %s = %s\n", key, value)
+			}
+
+			result := FetchEnvVars(tc.envSearchFor)
+
+			assert.Equal(t, tc.envExpectedResult, result)
+		})
+	}
+}