[Docker] use gcc to build

.docker/qgis.dockerfile

@@ -11,8 +11,8 @@ LABEL Description="Docker container with QGIS" Vendor="QGIS.org" Version="1.1"
 # build timeout in seconds, so no timeout by default
 ARG BUILD_TIMEOUT=360000
 
-ARG CC=/usr/lib/ccache/clang
-ARG CXX=/usr/lib/ccache/clazy
+ARG CC=/usr/lib/ccache/gcc
+ARG CXX=/usr/lib/ccache/g++
 ENV LANG=C.UTF-8
 
 COPY . /QGIS
@@ -55,7 +55,7 @@ RUN cmake \
  && SUCCESS=OK \
  && timeout ${BUILD_TIMEOUT}s ninja install || SUCCESS=TIMEOUT \
  && echo "$SUCCESS" > /QGIS/build_exit_value
- 
+
 # Additional run-time dependencies
 RUN pip3 install jinja2 pygments
 

.github/workflows/build-docker.yml

@@ -3,9 +3,9 @@ name: Build QGIS Docker images for current branches
 on:
   schedule:
     # runs every day
-    # - cron: '0 0 * * *'
+    - cron: '0 0 * * *'
     # every hour
-    - cron: '*/5 * * * *'
+    - cron: '* */1 * * *'
 
 jobs:
   build-docker:
@@ -18,6 +18,8 @@ jobs:
       DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
       DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
       GH_TOKEN: ${{ secrets.GH_TOKEN }}
+      CC=/usr/lib/ccache/gcc
+      CXX=/usr/lib/ccache/g++ # Building SIP binding freezes with Clang in Docker, maybe a SIP issue, maybe not
 
     strategy:
       matrix:
@@ -42,8 +44,6 @@ jobs:
         run: |
           DOCKER_TAG=${branch//master/latest}
           DOCKER_BUILD_DEPS_FILE=qgis3-build-deps-focal.dockerfile
-          CC=/usr/lib/ccache/gcc
-          CXX=/usr/lib/ccache/g++ # Building SIP binding freezes with Clang in Docker, maybe a SIP issue, maybe not
 
           echo "branch: ${branch}"
           echo "docker tag: ${DOCKER_TAG}"