CI: add working EPICS CI pipeline

.gitea/workflows/action.yaml

@@ -2,7 +2,7 @@ name: CI
 
 on:
   push:
-    branches: [ "main" ]
+    branches: [ "main", "ci" ]
 
 jobs:
   build-and-test:

README.md

@@ -171,4 +171,16 @@ ctest --test-dir build
 
 The source code for the test binary is in `test/m_epics_ca_test.cxx`. This file
 can also serve as a collection of examples for different record types, like
-`longin`, `ao`, `bo`, `stringin`, `waveform`, ... .
+`longin`, `ao`, `bo`, `stringin`, `waveform`, ... .
+
+## CI
+
+In CI, this test is run in the Docker container `lin/midas_base_gitea`. To
+manually run tests in the CI environment, log into the runner machine and use
+
+```bash
+sudo docker run --rm -it -v "$PWD":/workspace -w /workspace lin/midas_base_gitea bash
+```
+
+Please note that `EPICS_HOST_ARCH` is `linux-x86_64` within that container!
+Therefore, that environment variable must not be set explicitly within the test.

test/ioc/st.cmd

@@ -6,3 +6,5 @@ iocInit()
 
 # Initialize the waveform record
 dbpf("MEPICSCA:TEST:WAVEFORM", "ABC")
+
+echo "IOC running"

test/ioc/startioc

@@ -1,6 +1,10 @@
 #!/usr/bin/env bash
+
+# Note: EPICS_HOST_ARCH is not RHEL8-x86_64 in the CI docker container
+# (lin/midas_base_gitea), but linux-x86_64. So we do not specify it here, but
+# rely on the inherited environment.
+
 export EPICS_BASE=/usr/local/epics/base-7.0.7
-export EPICS_HOST_ARCH=RHEL8-x86_64
 export EPICS_CA_AUTO_ADDR_LIST=NO
 export EPICS_CAS_INTF_ADDR_LIST=127.0.0.1
 export EPICS_CA_ADDR_LIST=127.0.0.1
@@ -10,4 +14,5 @@ export EPICS_CA_SERVER_PORT=5064
 cd "$(dirname "$0")"
 export IOCDIR=$(pwd)
 
-exec ./st.cmd
+# In CI, we absolutely do not want an interactive shell!
+exec "$EPICS_BASE/bin/$EPICS_HOST_ARCH/softIoc"  -S st.cmd