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/public/elite/bower_components/datatables-plugins/i18n/Latvian.lang

@@ -0,0 +1,24 @@
+/**
+ * Latvian translation
+ *  @name Latvian
+ *  @anchor Latvian
+ *  @author Oskars Podans
+ */
+
+{
+	"sProcessing":   "Uzgaidiet...",
+	"sLengthMenu":   "Rādīt _MENU_ ierakstus",
+	"sZeroRecords":  "Nav atrasti vaicājumam atbilstoši ieraksti",
+	"sInfo":         "Parādīti _START_. līdz _END_. no _TOTAL_ ierakstiem",
+	"sInfoEmpty":    "Nav ierakstu",
+	"sInfoFiltered": "(atlasīts no pavisam _MAX_ ierakstiem)",
+	"sInfoPostFix":  "",
+	"sSearch":       "Meklēt:",
+	"sUrl":          "",
+	"oPaginate": {
+		"sFirst":    "Pirmā",
+		"sPrevious": "Iepriekšējā",
+		"sNext":     "Nākošā",
+		"sLast":     "Pēdējā"
+	}
+}