Revert "disable docker cache, clear ccache (once)"

This reverts commit 6f93be05d8f876e4a91dc32fee72877b7d489e45.

Author: pcaspers

Docker/Dockerfile-QuantLib

@@ -35,7 +35,6 @@ RUN cd /ore/QuantLib \
 WORKDIR /ore/QuantLib/build.ql
 RUN --mount=type=cache,target=/ccache/ ccache -z \
   && make -j ${num_cores} \
-  && ccache -C \
   && ccache -s \
   && make install \
   && cd / \

Docker/DockerfileRunORE.sh

@@ -1,7 +1,7 @@
 #!/bin/sh
 
 docker-compose --env-file Docker/.env -f Docker/docker-compose-boost.yml build || exit 1
-COMPOSE_DOCKER_CLI_BUILD=1 DOCKER_BUILDKIT=1 docker-compose --env-file Docker/.env -f Docker/docker-compose-quantlib.yml build --no-cache || exit 1
-COMPOSE_DOCKER_CLI_BUILD=1 DOCKER_BUILDKIT=1 docker-compose --env-file Docker/.env -f Docker/docker-compose-ore.yml build --no-cache  || exit 1
-docker-compose --env-file Docker/.env -f Docker/docker-compose-test.yml build --no-cache || exit 1
-COMPOSE_DOCKER_CLI_BUILD=1 DOCKER_BUILDKIT=1 docker-compose --env-file Docker/.env -f Docker/docker-compose-ore-app.yml build --no-cache  || exit 1
+COMPOSE_DOCKER_CLI_BUILD=1 DOCKER_BUILDKIT=1 docker-compose --env-file Docker/.env -f Docker/docker-compose-quantlib.yml build || exit 1
+COMPOSE_DOCKER_CLI_BUILD=1 DOCKER_BUILDKIT=1 docker-compose --env-file Docker/.env -f Docker/docker-compose-ore.yml build || exit 1
+docker-compose --env-file Docker/.env -f Docker/docker-compose-test.yml build || exit 1
+COMPOSE_DOCKER_CLI_BUILD=1 DOCKER_BUILDKIT=1 docker-compose --env-file Docker/.env -f Docker/docker-compose-ore-app.yml build || exit 1