add release note updater

relnotes.awk

@@ -0,0 +1,34 @@
+#!/usr/bin/awk -f
+
+BEGIN {stage=0};
+
+!/```/ && stage==0 {
+    print
+}
+
+/```/ && stage==0 {
+    print "```"
+    print "BAZEL_ZIG_CC_VERSION = \""tag"\""
+    print ""
+    print "http_archive("
+    print "    name = \"bazel-zig-cc\","
+    print "    sha256 = \""sha256sum"\","
+    print "    strip_prefix = \"bazel-zig-cc-{}\".format(BAZEL_ZIG_CC_VERSION),"
+    print "    urls = [\"https://git.sr.ht/~motiejus/bazel-zig-cc/archive/{}.tar.gz\".format(BAZEL_ZIG_CC_VERSION)],"
+    print ")"
+    stage=1
+    next
+}
+
+!/^)$/ && stage==1 {
+    next
+};
+
+/^)$/ && stage==1 {
+    stage=2
+    next
+};
+
+stage==2 {
+    print;
+};