Build modified streamline images

The official image from streamline does not currently work for the arm64
platform. As a temporary measure, the source code and docker build scripts
have been lifted from the official images and are used to build locally.

Some additional modifications are made to reduce overall image size, these
are documented in docker/README.md

docker/streamline-src/vendor/hamcrest/hamcrest-php/tests/Hamcrest/Number/IsCloseToTest.php

@@ -0,0 +1,27 @@
+<?php
+namespace Hamcrest\Number;
+
+class IsCloseToTest extends \Hamcrest\AbstractMatcherTest
+{
+
+    protected function createMatcher()
+    {
+        $irrelevant = 0.1;
+
+        return \Hamcrest\Number\IsCloseTo::closeTo($irrelevant, $irrelevant);
+    }
+
+    public function testEvaluatesToTrueIfArgumentIsEqualToADoubleValueWithinSomeError()
+    {
+        $p = closeTo(1.0, 0.5);
+
+        $this->assertTrue($p->matches(1.0));
+        $this->assertTrue($p->matches(0.5));
+        $this->assertTrue($p->matches(1.5));
+
+        $this->assertDoesNotMatch($p, 2.0, 'too large');
+        $this->assertMismatchDescription('<2F> differed by <0.5F>', $p, 2.0);
+        $this->assertDoesNotMatch($p, 0.0, 'number too small');
+        $this->assertMismatchDescription('<0F> differed by <0.5F>', $p, 0.0);
+    }
+}

docker/streamline-src/vendor/hamcrest/hamcrest-php/tests/Hamcrest/Number/OrderingComparisonTest.php

@@ -0,0 +1,41 @@
+<?php
+namespace Hamcrest\Number;
+
+class OrderingComparisonTest extends \Hamcrest\AbstractMatcherTest
+{
+
+    protected function createMatcher()
+    {
+        return \Hamcrest\Number\OrderingComparison::greaterThan(1);
+    }
+
+    public function testComparesValuesForGreaterThan()
+    {
+        assertThat(2, greaterThan(1));
+        assertThat(0, not(greaterThan(1)));
+    }
+
+    public function testComparesValuesForLessThan()
+    {
+        assertThat(2, lessThan(3));
+        assertThat(0, lessThan(1));
+    }
+
+    public function testComparesValuesForEquality()
+    {
+        assertThat(3, comparesEqualTo(3));
+        assertThat('aa', comparesEqualTo('aa'));
+    }
+
+    public function testAllowsForInclusiveComparisons()
+    {
+        assertThat(1, lessThanOrEqualTo(1));
+        assertThat(1, greaterThanOrEqualTo(1));
+    }
+
+    public function testSupportsDifferentTypesOfComparableValues()
+    {
+        assertThat(1.1, greaterThan(1.0));
+        assertThat("cc", greaterThan("bb"));
+    }
+}