feat: add global unset

[katcipis]

Reason for This Change

Add support to set a global to unset, which unsets the global. References to it will fail as if the global was never defined.

Description of Changes

Changed globals evaluation, removing any globals set to unset before starting the evaluation process.

Example

#!/bin/bash

set -o errexit
set -o nounset
set -o pipefail

workdir="$(mktemp -d)"
cd "${workdir}"

cat > terramate.tm.hcl <<- EOM
terramate {
  config {
  }
}
EOM

cat > globals.tm.hcl <<- EOM
globals {
    a = 1
    b = 2
}
EOM

terramate create stacks/stack-1
terramate create stacks/stack-2

cat > stacks/stack-1/globals.tm.hcl <<- EOM
globals {
    a = unset
}
EOM

cat > stacks/stack-2/globals.tm.hcl <<- EOM
globals {
    b = unset
}
EOM

terramate experimental globals

Will result in the globals being:

stack "/stacks/stack-1":
        b = 2

stack "/stacks/stack-2":
        a = 1

[codecov[bot]]

Codecov Report

Merging #528 (0e3c751) into main (b938d18) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #528      +/-   ##
==========================================
+ Coverage   70.11%   70.13%   +0.01%     
==========================================
  Files          52       52              
  Lines        9126     9138      +12     
==========================================
+ Hits         6399     6409      +10     
- Misses       2426     2427       +1     
- Partials      301      302       +1     

Flag	Coverage Δ
tests	70.13% <100.00%> (+0.01%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
stack/globals.go	90.64% <100.00%> (+0.58%)	:arrow_up:
stack/clone.go	74.76% <0.00%> (-1.87%)	:arrow_down:

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