move CI from travis to GitHub actions

scripts/gzip_fw.py

@@ -0,0 +1,39 @@
+Import('env')
+import os
+import re
+import shutil
+import gzip
+
+OUTPUT_DIR = "build{}".format(os.path.sep)
+
+def bin_gzip(source, target, env):
+
+    # get the version
+    bag = {}
+    exprs = [
+    (re.compile(r'^#define EMSESP_APP_VERSION\s+"(\S+)"'), 'app_version'),
+    ]
+    with open('./src/version.h', 'r') as f:
+        for l in f.readlines():
+            for expr, var in exprs:
+                m = expr.match(l)
+                if m and len(m.groups()) > 0:
+                    bag[var] = m.group(1)
+
+    app_version = bag.get('app_version')
+
+    variant = "EMS-ESP-" +  app_version.replace(".", "_") + "-" + str(target[0]).split(os.path.sep)[2]
+        
+    # create string with location and file names based on variant
+    bin_file = "{}firmware{}{}.bin".format(OUTPUT_DIR, os.path.sep, variant)
+    gzip_file = "{}firmware{}{}.bin.gz".format(OUTPUT_DIR, os.path.sep, variant)
+
+    # check if new target files exist and remove if necessary
+    if os.path.isfile(gzip_file): os.remove(gzip_file)
+
+    # write gzip firmware file
+    with open(bin_file,"rb") as fp:
+        with gzip.open(gzip_file, "wb", compresslevel = 9) as f:
+            shutil.copyfileobj(fp, f)
+
+env.AddPostAction("$BUILD_DIR/${PROGNAME}.bin", [bin_gzip])