initial ci workflows: build, test & lint

Signed-off-by: oppiliappan <[e-mail]>

.gitignore

···
 # Don't ignore this file itself, or other specific dotfiles
 !.gitignore
 !.github/
+!.tangled/
 !.golangci.yaml
 
 # Don't commit your (default location) creds

.tangled/workflows/build_and_test.yml

···
+when:
+  - event: push
+    branch: ["main", "ci"]
+
+dependencies:
+  nixpkgs:
+    - gcc
+    - go
+
+steps:
+  - name: build
+    command: make build
+  - name: test
+    command: make test
+
+

.tangled/workflows/lint.yml

···
+when:
+  - event: push
+    branch: ["main", "ci"]
+
+dependencies:
+  nixpkgs:
+    - go
+    - gcc
+
+steps:
+  - name: lint
+    command: make lint
+
+
+

Makefile

···
 
-SHELL = /bin/bash
+SHELL = bash
 .SHELLFLAGS = -o pipefail -c
 
 # base path for Lexicon document tree (for lexgen)