feat: git change detection works on any commit

[snakster]

Reason for This Change

Currently, the Git revision that's used for change comparison with terramate (run | list) --changed is selected based on these rules (simplified):

• If HEAD commit == origin/main, select previous commit
• Otherwise, select origin/main

This means for the two cases of either getting a preview of a deployment, or executing the deployment, it will select the changed stacks relative to the previous deployment (w.r.t. to the commit graph).

For anything before origin/main, it will not select the changed stacks relative to the previous deployment, but the changed stacks compared to the latest deployment.

This is inconsistent, and more importantly, can lead to unintended behaviour in case of queued CI jobs that are behind origin/main when multiple PRs are merged in parallel.

Description of Changes

The selection logic for the compared base revision is changed so that "select the changed stacks relative to the previous deployment"-behaviour works on any commit.

Simplified, this means any commit is now compared its fork point from origin/main.

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[github-actions]

metric: time/op
CloudReadLines-4: old 1.04ms ± 5%: new 1.02ms ± 4%: delta: -2.54%
CloudReadLine-4: old 7.34ms ± 2%: new 7.25ms ± 1%: delta: -1.26%
ListFiles-4: old 53.2µs ± 2%: new 53.1µs ± 1%: delta: 0.00%
Generate-4: old 2.65s ± 3%: new 2.65s ± 2%: delta: 0.00%
GenerateRegex-4: old 1.85s ± 3%: new 1.89s ± 2%: delta: 2.14%
TokensForExpressionComplex-4: old 1.29ms ± 1%: new 1.29ms ± 1%: delta: 0.00%
TokensForExpressionPlainStringNoNewline-4: old 901ns ± 2%: new 909ns ± 1%: delta: 1.00%
TokensForExpressionStringWith100Newlines-4: old 22.1µs ± 2%: new 22.6µs ± 1%: delta: 1.91%
TokensForExpressionObjectWith100KeysWithNumberValues-4: old 1.48ms ± 1%: new 1.48ms ± 1%: delta: 0.29%
TokensForExpression-4: old 1.29ms ± 1%: new 1.28ms ± 1%: delta: 0.00%
PartialEvalComplex-4: old 443µs ± 1%: new 445µs ± 2%: delta: 0.00%
PartialEvalSmallString-4: old 3.68µs ± 1%: new 3.70µs ± 1%: delta: 0.57%
PartialEvalHugeString-4: old 1.89ms ± 0%: new 1.89ms ± 0%: delta: 0.00%
PartialEvalHugeInterpolatedString-4: old 5.02ms ± 1%: new 5.06ms ± 2%: delta: 0.78%
PartialEvalObject-4: old 22.0µs ± 2%: new 22.8µs ± 3%: delta: 3.98%
TmAllTrueLiteralList-4: old 6.34ms ± 1%: new 6.37ms ± 2%: delta: 0.00%
TmAllTrueFuncall-4: old 164µs ± 1%: new 163µs ± 2%: delta: -0.53%
TmAnyTrueLiteralList-4: old 149ms ± 1%: new 149ms ± 1%: delta: -0.40%
TmAnyTrueFuncall-4: old 164µs ± 1%: new 162µs ± 1%: delta: -0.83%
TmTernary-4: old 2.86µs ± 1%: new 2.84µs ± 1%: delta: -0.72%
TmTry-4: old 52.6µs ± 1%: new 52.5µs ± 1%: delta: -0.26%
metric: alloc/op
CloudReadLines-4: old 3.12MB ± 0%: new 3.12MB ± 0%: delta: 0.00%
CloudReadLine-4: old 3.37MB ± 0%: new 3.37MB ± 0%: delta: 0.00%
ListFiles-4: old 22.0kB ± 0%: new 22.0kB ± 0%: delta: 0.00%
Generate-4: old 2.32GB ± 0%: new 2.32GB ± 0%: delta: 0.00%
GenerateRegex-4: old 956MB ± 0%: new 956MB ± 0%: delta: 0.00%
TokensForExpressionComplex-4: old 412kB ± 0%: new 412kB ± 0%: delta: 0.00%
TokensForExpressionPlainStringNoNewline-4: old 592B ± 0%: new 592B ± 0%: delta: 0.00%
TokensForExpressionStringWith100Newlines-4: old 12.4kB ± 0%: new 12.4kB ± 0%: delta: 0.00%
TokensForExpressionObjectWith100KeysWithNumberValues-4: old 402kB ± 0%: new 402kB ± 0%: delta: 0.00%
TokensForExpression-4: old 412kB ± 0%: new 412kB ± 0%: delta: 0.00%
PartialEvalComplex-4: old 356kB ± 0%: new 356kB ± 0%: delta: 0.00%
PartialEvalSmallString-4: old 1.74kB ± 0%: new 1.74kB ± 0%: delta: 0.00%
PartialEvalHugeString-4: old 166kB ± 0%: new 166kB ± 0%: delta: 0.00%
PartialEvalHugeInterpolatedString-4: old 4.38MB ± 0%: new 4.38MB ± 0%: delta: 0.00%
PartialEvalObject-4: old 20.4kB ± 0%: new 20.4kB ± 0%: delta: 0.00%
TmAllTrueLiteralList-4: old 1.74MB ± 0%: new 1.74MB ± 0%: delta: 0.00%
TmAllTrueFuncall-4: old 45.5kB ± 0%: new 45.5kB ± 0%: delta: -0.00%
TmAnyTrueLiteralList-4: old 37.9MB ± 0%: new 37.9MB ± 0%: delta: -0.00%
TmAnyTrueFuncall-4: old 45.6kB ± 0%: new 45.6kB ± 0%: delta: -0.00%
TmTernary-4: old 1.20kB ± 0%: new 1.20kB ± 0%: delta: 0.00%
TmTry-4: old 11.2kB ± 0%: new 11.2kB ± 0%: delta: 0.00%
metric: allocs/op
CloudReadLines-4: old 5.54k ± 0%: new 5.54k ± 0%: delta: 0.00%
CloudReadLine-4: old 60.0k ± 0%: new 60.0k ± 0%: delta: 0.00%
ListFiles-4: old 321 ± 0%: new 321 ± 0%: delta: 0.00%
Generate-4: old 25.9M ± 0%: new 25.9M ± 0%: delta: 0.00%
GenerateRegex-4: old 18.6M ± 0%: new 18.6M ± 0%: delta: 0.00%
TokensForExpressionComplex-4: old 4.93k ± 0%: new 4.93k ± 0%: delta: 0.00%
TokensForExpressionPlainStringNoNewline-4: old 21.0 ± 0%: new 21.0 ± 0%: delta: 0.00%
TokensForExpressionStringWith100Newlines-4: old 228 ± 0%: new 228 ± 0%: delta: 0.00%
TokensForExpressionObjectWith100KeysWithNumberValues-4: old 3.29k ± 0%: new 3.29k ± 0%: delta: 0.00%
TokensForExpression-4: old 4.93k ± 0%: new 4.93k ± 0%: delta: 0.00%
PartialEvalComplex-4: old 2.86k ± 0%: new 2.86k ± 0%: delta: 0.00%
PartialEvalSmallString-4: old 23.0 ± 0%: new 23.0 ± 0%: delta: 0.00%
PartialEvalHugeString-4: old 35.0 ± 0%: new 35.0 ± 0%: delta: 0.00%
PartialEvalHugeInterpolatedString-4: old 23.1k ± 0%: new 23.1k ± 0%: delta: 0.00%
PartialEvalObject-4: old 125 ± 0%: new 125 ± 0%: delta: 0.00%
TmAllTrueLiteralList-4: old 13.6k ± 0%: new 13.6k ± 0%: delta: 0.00%
TmAllTrueFuncall-4: old 460 ± 0%: new 460 ± 0%: delta: 0.00%
TmAnyTrueLiteralList-4: old 252k ± 0%: new 252k ± 0%: delta: 0.00%
TmAnyTrueFuncall-4: old 462 ± 0%: new 462 ± 0%: delta: 0.00%
TmTernary-4: old 28.0 ± 0%: new 28.0 ± 0%: delta: 0.00%
TmTry-4: old 147 ± 0%: new 147 ± 0%: delta: 0.00%

[mariux]

finally tested the PR, please check the notion document for comments on a case this PR now creates wrong results when calculating changes.

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[soerenmartius]

@mariux @snakster this needs to well documented also