ci: support to use lower case and colon substrings in build job variable

Signed-off-by: Chase Qi <chase.qi@linaro.org>

.oniro-ci/build-generic.yaml

@@ -136,13 +136,20 @@
     # dropped. Some extra sed processing is used to quote the variables.
     # Everything runs in a sub-shell with bash pipefail disabled, as otherwise
     # lack of variables matching the grep pattern causes the execution to stop.
+    # Variables in the form of 'CI_ONIRO_BB_LOCAL_CONF_attr' are converted to
+    # 'attr = "value"'. It can include '_colon_' substrings which are converted
+    # to ':'.
     - |
       ( set +o pipefail;
         env \
-          | grep -E '^CI_ONIRO_BB_LOCAL_CONF_[A-Z_0-9]+=' \
-          | sed -e 's/^CI_ONIRO_BB_LOCAL_CONF_//g' -e 's/"/\\"/g' -e 's/=/ = "/g' -e 's/$/"/g' \
+          | grep -v "_plus_equals_" \
+          | grep -E '^CI_ONIRO_BB_LOCAL_CONF_[a-zA-Z_0-9]+=' \
+          | sed -e 's/^CI_ONIRO_BB_LOCAL_CONF_//g' -e 's/_colon_/:/g' -e 's/"/\\"/g' -e 's/=/ = "/g' -e 's/$/"/g' \
           | sort \
           | tee -a conf/local.conf )
+    # Variables in the form of 'CI_ONIRO_BB_LOCAL_CONF_plus_equals_attr' are
+    # converted to 'attr += "value"'
+    - |
       ( set +o pipefail;
         env \
           | grep -E '^CI_ONIRO_BB_LOCAL_CONF_plus_equals_[A-Z_0-9]+=' \
@@ -150,7 +157,6 @@
           | sort \
           | tee -a conf/local.conf )
 
-
     # Sanity check: disallow using public build cache with a specific setting
     # in local.conf. The list of settings may grow over time.
     - |

docs/ci/hidden-jobs/bitbake-workspace.rst

@@ -89,9 +89,11 @@ Configuring BitBake
 
 The ``local.conf`` file can define numerous variables that influence the
 BitBake build process. This job offers a declarative method of doing that. Job
-variables with have the prefix ``CI_ONIRO_BB_LOCAL_CONF_`` are converted to
-``attr = "value"`` and those with prefix
-``CI_ONIRO_BB_LOCAL_CONF_plus_equals_`` are converted to ``attr += "value"``.
+variables can be of two forms. ``CI_ONIRO_BB_LOCAL_CONF_attr`` and
+``CI_ONIRO_BB_LOCAL_CONF_plus_equals_attr``. The former is converted to
+``attr = "value"``. It can include ``_colon_`` substrings which are converted
+to ``:``. And variables in the latter form are converted to
+``attr += "value"``.
 
 This method is friendly to job inheritance and re-definition. Derivative jobs
 can add or re-define variables without having to duplicate any imperative logic