feat: make default autobuild poll intervals configurable (#1618)

* feat: make default poll intervals for autobuild and ssh ttl polling configurable

cryptorand/numbers.go

@@ -3,6 +3,7 @@ package cryptorand
 import (
 	"crypto/rand"
 	"encoding/binary"
+	"time"
 
 	"golang.org/x/xerrors"
 )
@@ -193,3 +194,13 @@ func Bool() (bool, error) {
 	// True if the least significant bit is 1
 	return i&1 == 1, nil
 }
+
+// Duration returns a random time.Duration value
+func Duration() (time.Duration, error) {
+	i, err := Int63()
+	if err != nil {
+		return time.Duration(0), err
+	}
+
+	return time.Duration(i), nil
+}

cryptorand/numbers_test.go

@@ -175,3 +175,14 @@ func TestBool(t *testing.T) {
 	require.True(t, percentage > 48, "expected more than 48 percent of values to be true")
 	require.True(t, percentage < 52, "expected less than 52 percent of values to be true")
 }
+
+func TestDuration(t *testing.T) {
+	t.Parallel()
+
+	for i := 0; i < 20; i++ {
+		v, err := cryptorand.Duration()
+		require.NoError(t, err, "unexpected error from Duration")
+		t.Logf("value: %v <- random?", v)
+		require.True(t, v >= 0.0, "values must be positive")
+	}
+}