Update Makefile and CI script for Debian Bullseye

.gitlab-ci.yml

 buildtest:
-  image: debian:stretch
+  image: debian:bullseye
   stage: test
   script:
   - apt update
-    - apt install -y wget
-    - 'echo "deb http://www.deb-multimedia.org stretch main non-free" >> /etc/apt/sources.list'
-    - wget https://www.deb-multimedia.org/pool/main/d/deb-multimedia-keyring/deb-multimedia-keyring_2016.8.1_all.deb
-    - dpkg -i deb-multimedia-keyring_2016.8.1_all.deb
-    - apt update
-    - uname -a
   - apt install -y locales-all git build-essential make libavformat-dev libavcodec-dev libavfilter-dev libavutil-dev libxml2-dev libcurl4-openssl-dev
   - make
   artifacts:
     paths:
     - probe
     - probe-raw
-      - remux thumbnail
+    - remux
+    - thumbnail
     - transcode
     - publish_video
     - simple_live_transcode

Makefile

@@ -3,6 +3,9 @@ TARGETS = probe probe-raw remux thumbnail transcode publish_video simple_live_tr
 CFLAGS = -I /usr/include/libxml2
 LDFLAGS= -lcurl -lavcodec -lavformat -lavfilter -lswscale -lavutil -lxml2
 
+.c:
+	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
+
 all: ${TARGETS}
 
 probe: probe.c *.h util/*.c