ci: build: print log files of failed tasks

Signed-off-by: Leonard Göhrs <l.goehrs@pengutronix.de>

.github/workflows/build.yml

@@ -54,6 +54,21 @@ jobs:
             emmc-image \
             emmc-boot-image \
             tf-a-stm32mp
+      - name: Print logs of failed jobs
+        if: ${{ failure() }}
+        shell: python
+        run: |
+          PREFIX = "ERROR: Logfile of failure stored in: "
+
+          for ln in open("build/tmp/log/cooker/lxatac/console-latest.log"):
+              if not ln.startswith(PREFIX):
+                continue
+
+              path = ln.removeprefix(PREFIX)
+              content = open(path).read()
+
+              print("$ cat", path)
+              print(content)
       - name: Persist the disk image
         env:
           PERSISTENCE_TOKEN: ${{ secrets.PERSISTENCE_TOKEN }}