Added a one-off stanza for autoconf-based tests on Github Actions.

.github/workflows/run_tests.yml

@@ -250,3 +250,87 @@ jobs:
           cd build
           LD_LIBRARY_PATH=${LD_LIBRARY_PATH} ctest -j 12 .
         if: ${{ success() }}
+
+
+###
+# Autotools-based one-off tests.
+####
+  nc-ac-tests-oneoff:
+
+    needs: build-deps
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        hdf5: [ 1.10.7 ]
+        use_nc4: [ nc4 ]
+        use_dap: [ dap_on ]
+        use_nczarr: [ nczarr_on ]
+    steps:
+
+      - uses: actions/checkout@v2
+
+      - name: Install System dependencies
+        shell: bash -l {0}
+        run: sudo apt update && sudo apt install -y libaec-dev zlib1g-dev automake autoconf libcurl4-openssl-dev libjpeg-dev wget curl bzip2 m4 flex bison cmake libzip-dev
+
+###
+# Set Environmental Variables
+###
+
+      - run: echo "CFLAGS=-I${HOME}/environments/${{ matrix.hdf5 }}/include" >> $GITHUB_ENV
+      - run: echo "LDFLAGS=-L${HOME}/environments/${{ matrix.hdf5 }}/lib" >> $GITHUB_ENV
+      - run: echo "LD_LIBRARY_PATH=${HOME}/environments/${{ matrix.hdf5 }}/lib" >> $GITHUB_ENV
+
+
+###
+# Fetch Cache
+###
+
+      - name: Fetch HDF Cache
+        id: cache-hdf
+        uses: actions/cache@v2
+        with:
+          path: ~/environments/${{ matrix.hdf5 }}
+          key: hdf5-${{ runner.os }}-${{ matrix.hdf5 }}
+
+      - name: Check Cache
+        shell: bash -l {0}
+        run: ls ${HOME}/environments && ls ${HOME}/environments/${{ matrix.hdf5 }} && ls ${HOME}/environments/${{ matrix.hdf5}}/lib
+
+###
+# Configure and build
+###
+
+      - name: Run autoconf
+        shell: bash -l {0}
+        run: autoreconf -if
+
+      - name: Configure
+        shell: bash -l {0}
+        run: CFLAGS=${CFLAGS} LDFLAGS=${LDFLAGS} LD_LIBRARY_PATH=${LD_LIBRARY_PATH} ./configure --enable-hdf4 --enable-hdf5 --enable-dap --enable-dap-long-tests
+        if: ${{ success() }}
+
+      - name: Look at config.log if error
+        shell: bash -l {0}
+        run: cat config.log
+        if: ${{ failure() }}
+
+      - name: Print Summary
+        shell: bash -l {0}
+        run: cat libnetcdf.settings
+
+      - name: Build Library and Utilities
+        shell: bash -l {0}
+        run: CFLAGS=${CFLAGS} LDFLAGS=${LDFLAGS} LD_LIBRARY_PATH=${LD_LIBRARY_PATH} make -j
+        if: ${{ success() }}
+
+      - name: Build Tests
+        shell: bash -l {0}
+        run: CFLAGS=${CFLAGS} LDFLAGS=${LDFLAGS} LD_LIBRARY_PATH=${LD_LIBRARY_PATH} make check TESTS="" -j
+        if: ${{ success() }}
+
+      - name: Run Tests
+        shell: bash -l {0}
+        run: CFLAGS=${CFLAGS} LDFLAGS=${LDFLAGS} LD_LIBRARY_PATH=${LD_LIBRARY_PATH} make check -j
+        if: ${{ success() }}