Add Travis test for telemetry without OpenSSL

This change makes Travis compile the extension without OpenSSL support
(in addition to compiling with OpenSSL support). We also run only the
telemetry test, which is the only test so far that is affected by
SSL. This ensures that we can compile without OpenSSL and that tests
pass.

.travis.yml

@@ -15,7 +15,7 @@ before_install:
   - if [[ -z "$EXEC_BACKEND" ]]; then docker run -d --name pgbuild -v ${TRAVIS_BUILD_DIR}:/build -v /tmp/postgres:/postgres postgres:${PG_VERSION}-alpine; fi
   - if [[ -n "$EXEC_BACKEND" ]]; then docker run -d --name pgbuild -v ${TRAVIS_BUILD_DIR}:/build -v /tmp/postgres:/postgres timescaledev/postgresdev:exec_backend-${PG_VERSION}-alpine; fi
 install:
-  - docker exec -it pgbuild /bin/sh -c "apk add --no-cache --virtual .build-deps coreutils dpkg-dev gcc libc-dev make util-linux-dev diffutils cmake bison flex curl git openssl-dev && mkdir -p /build/debug"
+  - docker exec -it pgbuild /bin/sh -c "apk add --no-cache --virtual .build-deps coreutils dpkg-dev gcc libc-dev make util-linux-dev diffutils cmake bison flex curl git openssl-dev && mkdir -p /build/debug /build/debug-nossl"
   - docker exec -it pgbuild /bin/sh -c "apk add --no-cache --virtual --update-cache --repository http://dl-3.alpinelinux.org/alpine/edge/testing/ --allow-untrusted lcov"
   # We set /usr/local as prefix so the regression tools will be able to find
   # initdb, psql, and postgres
@@ -24,11 +24,20 @@ install:
   - docker exec -it pgbuild /bin/sh -c "make -C /postgres/src/test/regress"
   - docker exec -it pgbuild /bin/sh -c "make -C /postgres/src/test/isolation"
 
-  - docker exec -it pgbuild /bin/sh -c "cd /build/debug && CFLAGS=-Werror cmake .. -DCMAKE_BUILD_TYPE=Debug -DENABLE_CODECOVERAGE=TRUE -DPG_SOURCE_DIR=/postgres && make install"
+  # First build without OpenSSL
+  - docker exec -it pgbuild /bin/sh -c "cd /build/debug-nossl && CFLAGS=-Werror cmake .. -DCMAKE_BUILD_TYPE=Debug -DUSE_OPENSSL=false -DPG_SOURCE_DIR=/postgres && make install"
+  # Now build with OpenSSL
+  - docker exec -it pgbuild /bin/sh -c "cd /build/debug && CFLAGS=-Werror cmake .. -DCMAKE_BUILD_TYPE=Debug -DUSE_OPENSSL=true -DENABLE_CODECOVERAGE=TRUE -DPG_SOURCE_DIR=/postgres && make install"
+  # Ensure postgres user has permissions
   - docker exec -it pgbuild /bin/bash -c "chown -R postgres:postgres /build/"
 script:
   - docker exec -it pgbuild /bin/bash -c "chown -R postgres:postgres /postgres/"
+  # First run only telemetry test to see that it works without OpenSSL
+  - docker exec -u postgres -it pgbuild /bin/sh -c "make -C /build/debug-nossl installcheck TESTS=telemetry PG_REGRESS_OPTS='--temp-instance=/tmp/pgdata'"
+
+  # Now run all tests
   - docker exec -u postgres -it pgbuild /bin/sh -c "make -C /build/debug installcheck PG_REGRESS_OPTS='--temp-instance=/tmp/pgdata'"
+
   # some of the postgres tests don't pass with EXEC_BACKEND,
   # since this is merely a windows canary, not a real platform,
   # we simply disable postgres tests there.