ci: Dump the test log on failure

We need to see what failed, as Meson's test harness will just show the
result.

.travis/Dockerfile

@@ -27,5 +27,3 @@ ENV LANG=C.UTF-8 LANGUAGE=C.UTF-8 LC_ALL=C.UTF-8
 RUN pip3 install meson
 
 WORKDIR /root
-
-COPY epoxy-run-tests.sh .

.travis/epoxy-ci-linux.sh

@@ -1,5 +1,13 @@
 #!/bin/bash
 
+dump_log_and_quit() {
+        local exitcode=$1
+
+        cat meson-logs/testlog.txt
+
+        exit $exitcode
+}
+
 # Start Xvfb
 XVFB_WHD=${XVFB_WHD:-1280x720x16}
 
@@ -8,13 +16,17 @@ xvfb=$!
 
 export DISPLAY=:99
 
-mkdir _build
+srcdir=$( pwd )
+builddir=$( mktemp -d build_XXXXXX )
+
+meson --prefix /usr "$@" $builddir $srcdir || exit $?
+
+cd $builddir
 
-meson --prefix /usr "$@" _build . || exit $?
-ninja -C _build || exit $?
-meson test -C _build || exit $?
+ninja || exit $?
+meson test || dump_log_and_quit $?
 
-rm -rf _build
+cd ..
 
 # Stop Xvfb
 kill -9 ${xvfb}

.travis/epoxy-ci-osx.sh

@@ -1,5 +1,13 @@
 #!/bin/sh
 
+dump_log_and_quit() {
+        local exitcode=$1
+
+        cat meson-logs/testlog.txt
+
+        exit $exitcode
+}
+
 export SDKROOT=$( xcodebuild -version -sdk macosx Path )
 export CPPFLAGS=-I/usr/local/include
 export LDFLAGS=-L/usr/local/lib
@@ -12,8 +20,8 @@ builddir=$( mktemp -d build_XXXXXX )
 meson ${BUILDOPTS} $builddir $srcdir || exit $?
 
 cd $builddir
+
 ninja || exit $?
-meson test || exit $?
-cd ..
+meson test || dump_log_and_quit $?
 
-rm -rf $builddir
+cd ..