CI: Update build script inline comments

Signed-off-by: Michael Mayer <michael@photoprism.app>

scripts/build.sh

@@ -29,12 +29,12 @@ else
   BUILD_CMD=("$GO_BIN" build -ldflags "-extldflags \"-Wl,-rpath -Wl,\$ORIGIN/../lib\" -s -w -X main.version=${BUILD_ID}" -o "${BUILD_BIN}" cmd/photoprism/photoprism.go)
 fi
 
-# build binary
+# Build app binary.
 echo "=> compiling \"$BUILD_BIN\" with \"${GO_VER}\""
 echo "=> ${BUILD_CMD[*]}"
 "${BUILD_CMD[@]}"
 
-# show size
+# Display binary size.
 du -h "${BUILD_BIN}"
 
 echo "Done."