Update Makefile, add test workflow

The workflow comes from the mkiocccentry repo. This is an attempt to get
this working without the code populated (yet). The Makefile simply has
the rules added that seem to (me at this hour) be necessary to make this
work but it might be the Makefile has to be modified. It is not strictly
necessary to do this but it would be nice for later when (hopefully in
the next few months at most) the jparse code is actually moved here.

.github/workflows/test.yml

@@ -0,0 +1,39 @@
+name: C CI
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: install ctags
+      run: sudo apt-get install -y universal-ctags
+    - name: install shellcheck
+      run: sudo apt-get install -y shellcheck
+    - name: clone seqcexit
+      run: git clone https://github.com/lcn2/seqcexit
+    - name: install seqcexit
+      run: cd seqcexit && sudo make install
+    - name: clone picky
+      run: git clone https://github.com/xexyl/picky
+    - name: clone checknr
+      run: git clone https://github.com/lcn2/checknr.git
+    - name: install checknr
+      run: cd checknr && sudo make install
+    - name: install picky
+      run: cd picky && make && sudo cp -p picky /usr/local/bin
+    - name: make
+      run: make
+    - name: make slow_prep
+      run: make slow_prep
+    - name: make clobber all test
+      run: make clobber all test
+    - name: make clobber
+      run: make clobber

Makefile

@@ -1,3 +1,14 @@
 # compile do-nothing jparse.c - hopefully placate the GitHub workflow for now
 all: jparse.c
 	${CC} jparse.c -o jparse
+
+clean:
+	@rm -vf jparse
+
+clobber: clean
+
+slow_prep:
+	@exit 0
+
+test:
+	@exit 0